Does anybody know why my car started to buck or backfire while I am on the gas. Ever since I checked my gas pump a few months ago the car started bucking. But then my friend help me take out the gas pump again and nothing was wrong. Whenever I punch it in any gear and I press hard on the gas, the car will accelerate but it will buck while doing so. I haven't checked my sparkplugs in a while, was wondering if my plugs could be bad, or my gas pump might be going bad?? Not sure, I do have a dynoflash, or was wondering if I am perhaps pulling timing.

 

check your intake piping to and from the FMIC. you may have a leak.

 

that or your plugs could be fouled out.........

 

by the way, what plugs would you guys recommend and gap size??

 

br8es gap them to .024

 

My car did the same thing until I changed the Plugs

 

How often do u guys change yr plugs?

 

I change my plugs every 5k. For the original poster I would stick with plugs in the stock 7 heat rang since your mods really dont warrant you using colder plugs.

BPR7ES is what I use gapped to .026. Unlike 4tun8 you dont need colder plugs yet. With the copper plugs youll have to change them more often.

 

thanks everybody 8- )

 

Did you hit fuel cut?

 

plugs should do the trick, I had the same problem

 

I used BR8ES with similar mods to him, that's why I said that, and they worked great.

/shrug do what you want.

 

Yea I tried them in my VIII from info I got from a shop. The 7's seem to run a little better in my car. I also have about the same mods as him. I just posted cause I thought you were saying they are what you run with your 20G. And since hes on a stock turbo and only 21 psi I figured he dosent need anything colder than 7's

 

damn korean you look like a old man

 

could it be your clutch by any chance?