breakin up???????

[l3urnin0ut88]

question,,,today i installed 1.7 roller rockers,24lb injectors,c&l 73 mm mass air unit,and a bbk adjustable fuel pressure reg. on my 88 gt,i set the fuel at 38-40 lbs, whats happening now is at like 5000 rpm its breaking up,it did not do this before.,,any clues to why it is doing this..??????,,,it also has a gt-40 intake ,e303 cam,70mm throttle body,if this helps any,,,im confused,,,lol?

 

[BlownFiveLiter]

Does the C&L have the correct sample tube? Did you set the fuel pressure with the vacuum line off? Stupid question, I know, but it happens sometimes.

 

[l3urnin0ut88]

yes it has a brand new sample tube for 24lb injectors,and i did set it with the vacum line of,,,it seems to work great other then it breaks up aaround 5000 rpm,,,kinda sounds like a rev limiter??

 

[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.

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Or you can grind down the outside of a 7/32" deep socket untill it fits.