I'd do a New O2 sensor before anything else...at this rate you're losing over 20-25 bucks a week in gas money. You have already done everything else I'd do. You can see the sensor voltage and fuel trim ratios with your scanner depending on the type you have.
cheers
If I were him I would pick up a used hopefully low mileage compressor and be done with it. It is his coil, the clutch is physicly okay, right? I've replaced clutch bearings but not a coil but he could do the coil by itself possibly.
Call me stupid - wife's car came home sounding like a Harley. appears the weld broke or separated right at the pipe coming out of the big "box" where it heads back to the split to go to the dual mufflers (all stock) The big box is rippled and is after the spring loaded flange. What the hey is that thing a resonator? can I eliminate it? is it a cat? Any help would be appreciated. maybe still under warranty if its a cat?
Nevermind - found the FSM - its called a "chamber". Must be a resonator as its in the midpipe. Guess its going bye bye.
Must have picked up, eh? I agree with the super long pipe and rolling it. Bad news is if it did pick up it'll be a biotch the whole way off.
goog luck
bob