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it's rather spark plugs wiring, or spark plug themselves, or you have like we say over here a tired engine valve. what are you shocked? a tired engine valve can make this problemin your car. it did in my friend's toyota supra, he changed it and the rpm went back to its norm. first check out the sparks wiring and spark plugs. if the provlem persists, you should take out the whole engine out and change the valve.
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Danny
1994 Silver SVX in hybernation, awaiting for the monsterous awakening (Lebanon) 
1967 Mercedes-Benz 250SL Euro Specs, Hard/Softtop, White/Red. Under Complete Restoration 
2013 Mercedes-Benz SL350 Euro Specs, White/Red. Mint... Another step into SL Collection. 
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