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All the above is normal , except 2000rpm is a little high at idle . can be adjusted down to 1500rpm. the computer adjusts the engine speed . in drive the transmission loads up the engine idle drops to 1000rpm . in park engine unloaded rpm increase all normal.
Fuel system. Check filters and pump. Pump may run, but still not hold enough pressure to run engine as it should. I suggest replacing filters and pump anyway to rule them out as the problem. 95% sure its filter or pump.
(Not a mechanic) First thing to check is the transmission fluid level. If excessivly low it may not move. (Usually check trans fluid with transmission dip stick, while engine is idling and warmed up) Consult owners manual to verify procedure. If your fluid levels are normal or close to normal, you should call a transmission shop unless you are or know a good mechanic.
you didnt say if it was happening only during the initial warm up of the vehicle or all the time. if it is just during warm up this is not too unusual as long as the engine isnt racing. if it is just a "high idle", say arround 2,000 rpm's its normal. the idle would usually go down as the vehicle reaches operating temperature. when you put the vehicle in gear, you are actually loading the engine slightly, thats why the idle comes down then. when in park the engine has no load on it so it is free to rev a little higher at these times. if it a at a high idle constantly, then i would start looking for sticking throttle cable, binding throttle plates, ect and remedy the problem. this should not have anything to do with the dual exhaust.
What this sounds like is the throttle position sensor, or TPS. When this sensor goes out, you will experience the high idle that will not taper down. The good news is that they are fairly inexpensive and easy to replace.
i would first check the idle position sensor,located where the throttle cable ends at the tbi. check for broken wires or hoses, try un-plugging and see if the problem goes away. get back to me if you need more help. please rate my fix. Thanks Ray
I'd pull the "idle air control valve " (located on side of throttle body near front) off, and use some throttle body spray cleaner on it & the port it came out of. Spray pintle (pointed part) good to remove any gunk etc. Re-install, it & try it. if it cures your problem for a while & starts to act up again, replace it.
IF IT IS IDLED TOO HIGH THIS WILL CAUSE IT
you have some carbon buildup on pistons which is normal
the carbon gets hot and ignites the fuel and is why the engine "runs on" if it is idled too high it makes worse try running some top engine cleaner or sea foam thru engine and adjust idel