accel problems

[Cjfoxbody13]

I have a 91 LX 5.0 and it is completely bone stock. My father was the orig owner and I have had for a few months and drive it as my daily driver but, all of a sudden when i give it open throttle it hesitates after 4,000 rpm's. Like it is hidden the rev limiter. But not all the time... What should I change first? I was thinking spark plugs or fuel pump...

 

[jrichker]

The TFI module mounted on the distributor is usually the culprit for a high speed miss on a warm engine. If the problem does not occur when the engine is cold, the TFI module is definitely suspect. You may need a special socket to remove the TFI module, but most auto parts stores will have one for $5-$7.

Be sure to use plenty of the heat sink grease on the new TFI and clean the old grease off the distributor.

View attachment 250951

See Automotive Tools Specialty | Auto Mechanic & Technician Diagnostic, Testing Equipment | Thexton

 

[Cjfoxbody13]

Come to find out it was the alternator. The alternator and plug were shot. So I replace and so, so good... But thank for the info. Im going to go ahead and replace the TFI since its a cheap easy fix. I appreciate your help.