Miss At idle and Check Engine Light only at 40 and above!

2nd problem first. Did you unhook your battery at any point, during repairs? If no, go out and unhook it for a about 1/2 hour on that car. This will reset your fault codes to zero on the computor.
Then we can start fresh.
After rehook of battery, start and let warm up for about 5 mins. Then go for a short cruise but try to get to all driving ranges(stop/go, min speed limit, higher speed etc.). Do you get service engine light, how does your car perform? Are your drive belts as tight as they should be?
Usually rough idle if it just appeared will have something to do with whatever you have done.
Lets start there.
Let us know what happens and I can go through it with you on my Cavalier.
Kenvcr

This car has been doing this since I got it and I have cleared the code it gives me 32 EGR. I have drivien like you said and it is still the same. I have changed the TCC solenoid the plugs the wires the coil packs new head new iac new egr and solenoid. New belt and tensioner
compression is good on all cyleders. Could a worn timming chain cause this miss condition? The 2.2 GM stock chain and gears make alot of noise.I have changed alot of them. :(

A worn timing chain may make a lot of noise, but will not cause the problems you speak of. UNLESS your chain has skipped a few teeth.
If you have a lot of experience in this area, inspect it, see if the timing marks line up.
Unfortunately I can only think of the small vac hoses that might have a leak. Test each one.
Since you mention the timing chain, and a new head, Check that your bolts are torqued and the chain is installed properly.
Kenvcr