Need some help guys, misfires in 2nd and less in 3rd; it breaks up 4-5k then boosts fine. Replaced plugs and wires, then regapped plugs.....looks ok. Its the oddest thing, havent data logged since i don't have a pc.

It is tuned by Whalen speed and has most all bolts ons, ecmlink, fp68 w/ manifold, injectors fuel rail, braided fuel lines, aeromotive fuel filter and fpr, and fuel cell. I believe Whalen set the fpr higher than stock setting, it was 40 psi without the vacuum attached; i took it down to 37 and it made not difference to the misfires.

The car was tuned while the ac pulley was seizing up, actually shredded the belt; i'm wondering if this affects the tune since the ac belt is now off and there not more drag from it. Would appreciate any help.

Post a log.

So was it misfiring before or after the tune?

Was asking op.