98 cobra wont go past 4k rpm!!!!!!!!!!!!!!!

[jorgegt500]

hi its me agin. well i have 98 supercharged cobra when i go full throthlle it goes all right till 4k rpm it will go past 4k if i i let off and tap it slightly then it will go . its not spark blowout so rule that out guys .

-6psi
-bbk 255
-msd coils
-msd wires
-ngk spark plugs
-aftermarket maf
-42 bosch injectors

and here are some codes i pulled

-p0175
-p0172
-p0102
-p0122
-p1409

thers more but those are the most important ones . so im thinking its something with my tune? any help would be great thanks guys !:thumbsup::thumbsup:

 

[workmangc]

Hello,

Can you provide more information?
When did this start?
What are the other codes?
Did you recently have the car tuned?

 

[jorgegt500]

this started with previous owner the other codes aare one for obd readiness

 

[98fourvalve]

It's possible it's in the tune especially if the car is new to you and you didn't do the tune.

Do you know of any information about the tune? Who did it? When? What type of tuner? etc?
Have you checked what the voltage is at the TPS?
What kind of maf is it? Also, have you checked voltage?

 

[jorgegt500]

Tps voltage is fine and maf has current and it was tuned at force fed performance in roseville they mostly tune muscle cars

 

[Cookieman00x]

Did you load in the tune with an SCT handheld? If you did, put on the data logger and check it out.. Most tuners are willing to checkout logs from cars they have tuned that are having problems.