Its a 1991 3.9 L V6. Several gas tank fulls ago- I put in STP fuel injection concentrated cleaner, it helped allot, but now my truck is revving up to 2000 rpms wether I'm in park, or goin down the highway. Also, I took it on a 1600 mile road trip, soon after is when it started acting up. It was put on diagnostics but don't think anything was found- so could this have something to do with the fuel injectors? OR WHAT??? PLEASE HELP!!!

As far as I can think it would be a idle control motor or a vacuum leak. check all hoses and wires and if you cant find it. get a guage and unplug each hose and put the guage hose on that one and see if it changes. If you cant find it you might have the plenum gasket leak.

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93 Dakota Was 2wd 5.2 NOW 4X4 5.9RT 33x12.5 6in lift 1/4mile 15.259 85mph over 1ml el 14.2 sea lv. http://www.youtube.com/user/truck93 "No truck should ever be lowerd! NEVER"

I once had a similar problem goin down the road and all of a sudden my rpms would start bouncing all around and sometimes it would eventully stop. But it sent a code for the EGR and I changed that but it didn't help, but what it turned out to be was the O2 sensor.

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1993 Dodge Dakota V8 5.2/318 4x4
K&N Cold air intake, Super 40 flowmaster, Bored .020, Limited Slip, Forged Pistons, 31" tires, Flowtech headers, 3in lift, bully bar
Future Mods: 33" tires, electric fan, Roller rockers, Oil cooler, 3in exhaust

what is a tbs?

gutzy.

Sounds like you're referring to the throttle position sensor, they can do this to these trucks

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'95 Dodge Dakota 4x4 5.2L club cab - 224kmi - Dual Exhaust, Filtercharger, Duals, sh--load of lights
'92 Dodge Dakota 4x4 3.9L club cab - 166kmi - V8 TB, '95 grand Cherokee Self-Dimming mirror - soon to have new exhaust