ERR!! Z71 stil stumbling

[whitelightnin92]

ok when my truck idles for a long period of time and i hop in to take off it almost dies then picks up and goes on no problem. i have played with fuel pressure and no help. what could it be. o yea. it has a tbi350 with tbi mods, duals, and hypertech chip. ive thought it could it be my IAC valve but not sure. any help will be greatly appreciated

[whitelightnin92]

anyone out there.....?

[90C350]

It wouldnt surprise me if its the Hypercrap chip that is causing you the problems.Have you tried putting the stock chip back in and making sure that the fuel pressure is at the factory setting?? I would give it a shot. It could be that they increased the fuel at lower rpm's do to the extra timing they normally add, and now you have a rich tip in after warm idle. I would also suggest getting into doing your own chip burning.

[whitelightnin92]

yea that chip has been in the truck for years with no trouble. i dont think it is rich, it doesnt really matter where my fp is set. as soon as i get the $ i will start my own tuning