It seems that my car has gone off the wall recently. I've tried two different PFC's but my idle remains the same.

Half the time it will be normal (-4, -6 or 4,-6 whichever it is) But other times it will idle smoothly albeit, at -4 -20.. I suppose that could hint at somthing mechanically wrong, but any idea why this would be happening?

I have also noticed that my car seems to be pulling much weaker then it used to in third and 4th gear, but second is still very very strong.

Anyway, I appreciate any help greatly.

Thanks!

 

Since you have tried two different PFCs with the same results, ask yourself what else affects timing outside of the PFC?

Map sensor pressure which is PIM voltage, and the two timing pickups from the pulley.

Now go analyze/test those.