I've developed a stumble or miss when I'm on the throttle lightly. It will clear up if I step on it. It is really noticeable with the TC locked around 1800 rpm and somewhat noticeable at lower speeds (TC unlocked) and lower RPM's. So far I've replaced my rubber fuel lines, fuel filter, and pre-heater gasket thinking the I possibly had a little air being drawn into the fuel. (I can see a few bubbles right when I crack the injector lines but it will clear up in a few seconds). I also re-installed my 180 injectors and it actually seemed to make the stumble at lower RPM's more noticeable. Boost, EGT's, oil & coolant level are all good. About 2 months ago I did have my timing bumped from stock to 15.5°. I'm thinking (hopeing) that it may have slipped. The TC seems to hold good in lockup so I don't think it's starting to separate. Any ideas?? HELP...

TIA

Paul

 

I've had this too since day 1. I notice it mostly when going down hills at interstate speeds, the engine is coasting, and you put your foot back into it.

 

Mine is only when lightly accelerating or "trying" to keep speed when going up a hill on the highway.

 

My former 12v (95) did the same thing after the addition of the 370s. I also have heard that it is a governor spring issue. One more avenue to think about.