High RPM stumble/missfire/loss of power

[heliopilot]

Help.....

I am experiencing a high rpm stumble/misfire/ loss of power at 2500 RPM's and above. this vehicle has never had a box on it ever. it has 275's and a boost mod. the lift pump was replaced a weeks ago by the dealer, low pressure. this vehicle is running treated #2 summer blend. there are no codes present. is this typical of a vp44 on it's way out or fuel jelling? vehicle in question was manufactered in 98 as a 99 model yr. 40k miles all response are welcome.

 

[LSMITH]

Your problem could also be a clogged fuel filter. Check the pressures pre and post filter. Any more than a 5 PSI difference means that the filter is clogged, I change mine at 3 PSI difference. If you don't have the guages to check your fuel pressures throw another filter in it and try that. You really should look into getting a setup to check your fuel pressure regularly if you don't put in a full time fuel pressure guage. Your problem definately sounds like the engine is starving for fuel. Lift pump, filter, and ice are all likely candidates. Hope this helps.

 

[Dave Ratcliffe]

High RPM Stumble

Heliopilot,



I added a boost module to compliment my Phase II injectors and I immdiately noticed a high rpm stumble like you mentioned and also a loss in power. I took the module off and the truck ran better. Don't get me wrong, I'm not advocating leaving the wastegate stock. I'm going to let an EZ box (w/ elbow) take care of my boost issues. Maybe the module is faulty?

 

[Ron Moss]

try changing your air filter,had that problem with mine replaced air filter and problem was gone!!!!!!! good-luck