either the throttle position sensor (TPS), or a vaccum leak
It should idle at aprox 650 rpms warmed up.
Roughly 800 RPMS while in park and roughly 600 RPMS while in drive or reverse
Your car will idle high until the engine begins to warm. You could set the idle to be a bit lower, but that may cause the engine to stall out when it's cold out. The engine should begin to lower the RPMs when it is warmed up.
900rpm, and 600 rpms, respectively.
no
Could be your idle valve
Check the timing and check that the cable to the accelerator is adjusted correctly.
maybe a vacuum leak
it sould idle like any other car around 700 or 800 rpms.
Obviously depends on RPMs. Normally 15-20psi at idle. Could be as high as 30-40psi when the engine is under high RPMs.
hopefully by 80 u mean 8000 rpms i'd say ur idle is set too high because the car won't idle at 80 rpms once it goes below a certain point it cuts out so i'd say find a way to loosen the throttle cable
You have a vacum leak. A big one. Check all your hoses. Idle should be under 1k rpms