Same thing happen to me right after my tune replaced my plugs and that fixed te problem ..

 

thanks guys... i will be replacing the plugs today.... but my tuner also mentioned the fuel pump housing????... i have the walbro 400lph..... what do i need to check regarding the housing??

 

please start whit the plugs , and write here and tell of its gets better.

 

will do
thanks

 

I had the same jerky feeling after a brand new NGK plugs installed and tuned. They re-gap the plug I believed it was .20 and everything was back to normal. Good luck though

 

update: changed the plugs but same thing happened.
so i decided to check the fuel pump and there the fuel pump came off from the housing.
the guy who installed my walbro 400 lph cut the bottom part of the housing and the only part was holding the pump was the hose, so the pump was literally floAting inside the gas tank!lol... so i placed the pump back into the housing, drove the car and damn! its a beast again!!!!!

thanks guys!

 

good work mate . you u dont hire the guy to make any more install on your car

 

Nice to hear that. Sometimes it can be the smallest
things that's why evoM is here to help other members out.

 

Awesome...nice to know. Hopefully I never have this same problem, but good to know anyways

 

my car does this same thing sometimes. and i have a similar setup guess i gotta look into this

 

same thing happened to me, mine was an easy fix though. what had happened was my connector for my throttle position sensor and disconnected. the car drove normal until i went under boost then it would just bog down and back fire. check that and let us know what it really is when you find out!

 

sorry didnt read the whole thread at first just saw that you fixed it good work bro!