TDIME479

ok i just bought my 86 camaro it has the 2.8 fuel injected in it....well when i got it it would run and drive fine you just had to keep your foot on the gas when you stopped or it would die out and it idled probly at 2k rpm. Well i changed the plugs,wires, oil, oil filter, and cleaned the throttle body out... now its idling crazy high probly at like 4k (my rpm gauge doesnt work). Im going tomorrow to get a tps and a new fuel filter (just for the hell of it). if that fixes it ill let yall know but does anyone know what else might be wrong with it???? anything would help.....