My 1992 gmc jimmy idles at 1300 rpm or higher is there a way to adjust the idle?

The 2.2L of that year would be the 5S-FE engine.
It used an electronic Idle Speed Control Valve.
With all of the intake/vacuum system connected connected, accessories off and the transmission in neutral connect a tachometer. Short terminals TE1 and E1 of the underhood check connector.
Wait for the idle to maintain 1000-1300 RPM for 5 seconds.
If needed adjust the idle adjust screw to an engine speed of 650+-50 RPM.

US Idle is 700+-50 RPM, CA M/T is 800+-50 RPM and CA A/T is 750+-50 RPM.

Remove jumper of E1 and TE1 of the check connector.

adjust screw so you get highest rpm. for this to work you need good vacuum reading and stable idle, and a good timing

hope it helps

The truck ECM computer controls the idle speed based on a number of engine parameters. Idle drops to a minimum preset level when engine coolant reaches normal operating range and the engine goes into closed loop control. This idle is typically set at around 575 rpm, and cannot be changed without reprogramming the ECM. The miss is not caused by the idle speed - unless the engine is tuned properly and has not lost compression, this idle speed can result in a rough running engine at idle (typical with older 4.3L Vortec engines). Best bet is to get a complete tuneup which will include checking the O2 sensors, catalytic converter and cleaning the IAC valve and throttle body.

Check the vacuum hoses, and the intake manifold gasket for a leak.

If you have gears it could be the pilot bearing...When they go bad they make a noise...But whatever it is it's moving motor speed

Have you checked for vacuum leaks around the throttle body or intake manifold? If not try that.

I assume the check engine/ service soon light is on. Commonly the MAP sensor is the culprit, but can be TPS, CSS, even a buggy O2 sensor. Only way to be sure? (light or not) is to scan it.

bad fuel injectors! i replaced the pump and flue filter and did same thing idle for minute then kill.

Is this the Vortec engine? If so, the fuel injector spider, has a built in pressure regulator and i would say it is spraying way too much fuel into the cylinders. At the same time is is washing your cylinders of lubrication, and that itself is not good.

if this is a throttle body motor which probably is check for vacuum leak were the throttle body bolts on to the intake .the gaskets go bad after awhile .or listen to here a hissing sound try to locate and you might find a vacuum leak there.