PULSATING IDLE, need help!

[lostboykev]

I have a 93 Chevy Cavalier Z24 with a 3.1 LH0. I'm in real big trouble here. My cavalier is the daily driver and I'm stressing out on this idle issue, not knowing when my car is gonna eat sh*t and die. When I am in drive and let go of the break it stays about 750 -900 rpm. But when it starts to pick up pace ( no even accelerating, just letting it idle) to a certain speed it will go immidialtely to about 1100 -1200 rpm. which is abnormally high. so that gets the car to about 15mph and stays at that idle speed. and if I go the right speed between 10 and 15mph it will switch from those two idles (750rpm and 1200rpm) at a constant back and forth motion. does anybody know why this could be?

[[ChaosweaveR]]

Hmmmm...

Is the SES light on?

I'd suspect these things:

1) Dirty throttle body
2) Bad IACV
3) Bad MAP
4) Bad TPS
5) Vacuum leak

[lostboykev]

it depends. somtimes when i start the car and go into drive it will light up. othertimes it takes a while. and on some occasions it goes away. but im leaning toward the tps. i just noticed if you put any tention on the connector plug it will raise the revs.

[[ChaosweaveR]]

it depends. somtimes when i start the car and go into drive it will light up. othertimes it takes a while. and on some occasions it goes away. but im leaning toward the tps. i just noticed if you put any tention on the connector plug it will raise the revs.

Switch out the TPS sensor then, they're not expensive to replace.