2004 Subaru Impreza Reved too high too cold. engine now kno

2004 SUBARU IMPREZA
104,000 MILES • 4 CYL • AWD • MANUAL
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TREADS900
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about a month ago i revved my engine a little too high when it was probably way too cold. ever since then my engine's performance has gone downhill. it starts fine, but as soon as i give it a little gas it knocks then goes into it's normal sounding rev's. however as soon as i put it in gear and start to drive the car shakes and is slow to go, i have to give it a lot of gas. Also when it's sitting idleing the car is fine when it's cold, but as soon as it heats up the whole car starts to vibrate. also i just took a trip my mileage used to be about 35 mpg, i could go from regina to swift current on a full tank and end with just under 3/4's of a tank. this last trip took 3/4's of a tank to get there... anyone have an idea of what it is? I know it sounds expensive, it also has aftermarket venom injectors. and a larger turbo.
Feb 6, 2009 at 9:44 AM
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2CARPRO JACK
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Sounds liek you hurt it internally. A turbo engine should never be reved up cold or right before shut down, especialy with performance upgrades you describe. SOunds like the bottom end may be hurt or possibly a broken piston, with these kinds of things you kind of need to take them apart to get at the problem
Feb 7, 2009 at 9:04 AM