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i had a 1995 cougar that did the same thing..but only when idled over 2 grand...and i that was due to a spun bearing..if you mud the truck that could be the issue..
ok basically what my truck does is, if the check engine light is on..truck runs fine wont idle high nothing just runs good, but once that light goes off, its a whole other story, it will idle all the way up 2000 then bounce between 1500 and 2000 and will not come down..if you put it in gear it will slow to 1000 and no lower, it has become hard to hold it back at a stop light, i have bought a new upper intake gasket and a tps sensor, have not installed yet, just want to know is there anything else i should try while im at it? the codes it throws are a tps, too much voltage to the tps and trans slippage, but i believe that is from the idle running so high. the truck dont know what to do when its running like that.