Power issues 01 Cobra

So lately I’ve been experiencing something weird a missfire with no check engine light at all but it can be felt hard sometimes . With the SCT tune it’s less but still enough to be felt mostly on Decel and without the tune it’s like highways speeds 55-65 it’s just misfire city spark plugs are fresh and I’m not geting a check engine light at all for that I have codes for o2 censors since I have a off-road midlife and other stuff lately the car has just felt completely sluggish not on its toes . It is a higher mileage cobra it’s at 151k miles so I don’t expect much from it but still it just doesn’t feel right any idea what I can check out on I don’t know where to start

First thing I would do , replace the coil on plug boots and springs .
Coils , from experience are probably fine .
Napa sells a set of boots with springs , at a decent price.

Be sure to use dielectric paste on both the coil end and the plug end .

Ill

ashleyroachclip said:

First thing I would do , replace the coil on plug boots and springs .
Coils , from experience are probably fine .
Napa sells a set of boots with springs , at a decent price.

Be sure to use dielectric paste on both the coil end and the plug end .

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I’ll give that a try problably a good chance to upgrade to something better

Jayystangz said:

Ill



I’ll give that a try problably a good chance to upgrade to something better

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Stick with stock stuff.

I've been happy with stuff from o'reilly's

There is no upgrade here , just maintenance items that wear out .
Boots and springs are really fine from most any place .
I just mentioned napa because most people have one close .

There could be a lot of possibilities going on here, no check engine light doesnt mean it may not have thrown some codes---thats the first thing is to check for codes, with the mileage a compression check should be done, also look for vacuum leaks. I wouldnt start replacing parts without first doing the checks mentioned above. On deceleration I would rule out fuel, usually you dont have a misfire on deceleration , although if its happening at hiway speeds it may be injectors. Also you need to check your fuel pressure, could be fuel pressure regulator or a fuel pump or maybe as simple as replacing the fuel filter.

ashleyroachclip said:

There is no upgrade here , just maintenance items that wear out .
Boots and springs are really fine from most any place .
I just mentioned napa because most people have one close .

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This.

One of the telltale signs on a car that lets you know the owner probably doesn't know what they are doing is aftermarket coils. Boots/springs are all that need to get replaced and can be got from Napa, Rockauto, Amazon etc... That is the first step and then go from there.

Unless you have deep pockets, diagnose first before throwing parts at the car because coils, boots, etc will be a waste of money if for example the motor is worn out.

Ironmancanada said:

Unless you have deep pockets, diagnose first before throwing parts at the car because coils, boots, etc will be a waste of money if for example the motor is worn out.

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Read his entire post , before throwing remarks out there ...
Boots and springs are under 20 dollars and an hour of time to change.

FIREBALL said:

There could be a lot of possibilities going on here, no check engine light doesnt mean it may not have thrown some codes---thats the first thing is to check for codes, with the mileage a compression check should be done, also look for vacuum leaks. I wouldnt start replacing parts without first doing the checks mentioned above. On deceleration I would rule out fuel, usually you dont have a misfire on deceleration , although if its happening at hiway speeds it may be injectors. Also you need to check your fuel pressure, could be fuel pressure regulator or a fuel pump or maybe as simple as replacing the fuel filter.

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Now that you bring this up about fuel I have noticed my fuel gauge dieing and coming back mid drive for no reason


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