Well I'm off to the ARRC. I got the 300ZX good and warm last night and it doesn't seem to run too well. I think it has a condition that may be getting worse.

Basically, it backfires quite a bit. It has done this in the past, for example during gear changes, etc, it seems to have trouble running well between idle and about 3500 rpm, and sometimes it has backfired a little through the intake while I have been tinkering with it.

The motor has none of the emissions stuff - all disconnected and plugged. There are no vacuum leaks I can find. I have checked cam timing, ignition timing (15 degs at idle), condition of rotor, cap etc. The only codes showing on the compter are the fuel temp sensor (the tab is busted off) and once it showed the crank sensor position.
I have tried to play with the screw in the AFM but it seems to make little difference to the way it runs. I am guessing that turning the screw in (clockwise) is going lean? I have also tried different timing but that doesn't seem to help either. I have also tried different ECU's.

I was wondering if anybody would have any ideas - things to try. Without having an air/fuel mixture reading it's hard to say what is really going on. Maybe a treip to the dyno is in order.

Some basic questions:
- does turning the mixture crew on the AFM clockwise go lean?
- Any way to verify operation ot the cyl head temp sensor?
- Any guess on an optimal timing setting for a race car?

Thanks, timo