I've posted this in other places and am not getting anywhere. Maybe this will be my lucky day. O.K. It all started w/ a poor idle and stumbling like it was about to cut off rpms very low like around 200. would't accept gas like it was flooding out. rpms finally shoot back up, a couple times shot up to 2000. SES light finally came on #6 misfire. Changed plugs and wires and didn't solve the prob. Next I swapped coil packs w/#4 still showed up #6 misfire. Ohmed injector and it reads the same as the others. what else could it be. Also if it is running OK and I want to show someone the prob all I have to do Is turn on the A/C or defrost and 9/10 it will bring the problem up. This led me to belive the IAC but what does that have to do w/#6 misfire.

 

do you hear any strange noises comming form teh engine bay

and we need a list of mods

 

No, no strange noises, no mods accept tb bypass and magnaflow exhaust. K&N filter. Also went with Ngk TR55's and GM Performance wires (red) Only strange noise would be when it is in it's problem mode underneath the car rattles I figured cause the engine is shaking so bad, Near drivers side y-pipe goes away when I press in the clutch.

 

Anyone?

 

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I got your pm, but I'm not sure what that could be. On the other thread you mentioned the value springs, have you check them?
You may want to list all your mods, it might help in getting more responses and it will help get a better idea of what might be going on. Have you done any mods recently?

 

I haven't done any mods recently and I listed what little bit of mods I have done under humpinss's response