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I would check for an vacuum leak first, vacuum leak depending on what line its on can raise the rpm. you don't want to go a round just changing parts, also if the mp sensor has gone you would have engine lite fault on the dash. vacume line you dont. even a gasket leak you dont. intake manifold next to the vacuum valve pvc type just to the left.
One common problem is a vac leak or a sticking throttle plate. The computer controls idle speed by how much air is allowed into the intake. The idle control valve could be sticking even tho you have cleaned it, or have a faulty motor.
If you have the 5.0 liter engine or the 5.8 litre there was a problem with the upper intake manifold gasket being cracked and sucked into the intake causing a vacuum leak and the result was high idle. Also a leaking egr will sometimes cause high idle.
YOU SHOULD HAVE VACUUM AT IDLE TO MAP SENSOR.WIDE OPEN THROTTLE VACUUM WILL DROP. SO YOU NEED CHECK AND REPLACE ALL VACUUM LINES ON INTAKE MANIFOLD.THATS WHERE YOUR MAP SENSOR GETS IT VACUUM FROM.
is it idling high and you put it i gear it runs rougher and smoke black check your coolant sensor also connection or sensor itself and fuel pressure if high check for return line blockage also vacuum leaks make sure you have the right vacuum going to your map sensor you need to check right vaccum at idle going to your map sensor/
may need to have a fuel injection service,but when i worked at chevrolet i believe those year trucks were having a problem with the throttle body sticking
is the check engine light on ? if it idling high chances are you have a vacuum leak take a can of carb cleaner and spray the egr valve and if the engine rpm changes replace egr valve the throttle body may also be plugged pull the vacuum line off the map sensor start vehicle and see if you have vacuum if not remove throttl body and clean vacuum passage hope this helps
intake manifold next to the vacuum valve pvc type just to the left.
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