My 1990 camaro with 350 tpi will idle fairly decent while in park and nuetral, but when i put it in reverse or drive the idle drops and becomes very erratic and choppy. It also will not rev up when the gas pedal is pressed, and smells a little rich when idleing. Feels like a car that has a MAF unplugged, but mine doesnt have one of those. Anyone have any suggestions? I changed plugs, set timing, checked fuel pressure, all the obvious stuff. Please help as I am out my daily ride and dont know where else to look.