car is stumbling under 2k

[Bearden86]

My car has recently started stumbling and hesitating when under medium throttle but only when under 2k rpm's. If I stay real light on the throttle its fine, but if I even go 50% throttle it stumbles and falls on its face till its past 2k rpms. I've checked for vacuum leaks and my plugs look fine. The car pulls great past 2k any ideas to check for?

 

[hotcobra03]

weak coils,change all8..ford racing sells set very cheap and are oem..

auto nation aka tousley site vendor,,

 

[Bearden86]

Is there any way to check them first I don't want to waste unnecessary money

 

[hotcobra03]

Is there any way to check them first I don't want to waste unnecessary money

yes.i found a member that had a good set to try.

google.how to test ford 4.6 engine sensors with multimeter.

caution a weak coil can pass test but fail underload.hence weak coils.

i pd 225 for set

 

[Bearden86]

Ok I'll give that a try thanks for the help

 

[Bearden86]

All my coils measured .5-.9 ohms so I guess that's the culprit. Ill change the coils and see if that helps


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