I need to buy a new:

* TPS sensor
* IAC motor
* MAP sensor

Why?

Jeep (99 Auto Limited with 120,000 miles) has a rough idle and RPMS jump around between 400 and 700. You can feel large shakes sitting at the lights.

I have replaced spark plugs (gapped correctly), air filter, leads and distributor.

Rockauto seem to be cheap but are they good to use (ACdelco, standard motors etc) ???

I bought my WJ a new IAC motor off them and it was crap - bought one from the Jeep dealer (Mopar) and it was perfect

I have also noticed when I search for these parts on Quadratec / Morris 4x4 thier pictures of the sensors dont match what I have for a 99, but if I go under as a TJ the parts match??

 

mopar all the way.. they might cost a little more but they work better in my experince and a great investment in the long run

 

I buy plenty of aftermarket parts, but engine management sensors I try to exclusively buy Mopar. (except for the oxygen sensors where I buy NTK from whomever offers it at the best price; NTK is the OEM supplier of oxygen sensors to Jeep so it's the same sensor as you would buy from Jeep).

If you can wait a few days, there are online sources for genuine MOPAR parts that offer a pretty decent discount. I have had very good luck and can't beat their pricing.

http://www.moparonlineparts.com/

http://www.factorymoparparts.com/

http://www.tapcointernational.com/store/

 

For MoPower, go Mopar!