I fixed all my vacuum issues, replaced egr, changed the TSS, cleaned the throttle body, replaced IAC, I've got a new fuel pump, and I have a new rotor and distributor set. I had a NAPA mechanic tell me that the RPM is computer controlled on this model. He said if its running clean I'm chasing geese trying to raise the RPM. I was told it should run 7-1000, but it is running smooth at 4-700. I mean I'm probably getting better mileage, but something doesn't seem right. Any thoughts?

Warm engine, in gear, should idle around 600 or so.

Did you use an external tachometer, or are you relying on that guessometer in the dash to determine it's 400RPM?

RwP

Thank you she is idling perfect if that is the case! I need to fix my dif next. The pinion gear or bearing is definitely having issues.

I know, I can barely trust this dash. Since I replaced the TSS, the RPM gauge seems to be reading well though. Is there a free way I can get an exact RPM reading?

Borrow a timing light....Advance or Auto Zone may lend them for free.

TSS has nothing to do with the tach; it's driven straight off the ECU.

However, the frequency/current or voltage conversion is done by a board on the instrument cluster, and THAT can vary out of spec.

To get an exact RPM, borrow a real service tachometer. Do be aware that some tachs will have problems with a stable reading off the coil, though

You can cheat with a timing light; count how many flashes in 10 seconds, and multiply by 2, then the number of cylinders, and that's your idle speed in RPM.

RwP