So after replacing my injectors and cleaning my throttle body really well I think I may have damaged my TPS or maybe the IAC. in drive it idles very smooth, better than it did before. But just the other day when I put it in reverse it drops to about 500-525 rpm and starts to vibrate pretty bad, not really a shaking rough idle but vibrating. And when I try to turn the wheel it gets really bad. It also does this in neutral but not in drive and not as bad in park.

So because it doesn't do it in any drive mode I don't think it's a vacuum leak. But since it gets worse when a accessory Is in use I'm leaning to the IAC. Any thoughts are greatly appreciated!

 

I am in agreement with you; check the wiring connectors on both, perhaps you bent a pin, pulled a wire out, broke a wire...pushed a connector out so that it is not mating....all things to take a look at. Trouble with replacing the IAC or TPS...neither are returnable items to most parts store since they are electrical parts.

Operation of the TPS is easy to check though...just use an ohm meter and move the TPS through its range and watch the resistance reading. Best to do this with an analog meter than a DMM....easier to see abrupt changes in the resistance.

I also suggest checking the EGR valve....just to be sure that some carbon is not stuck in the valve.

Be sure to post what you find.