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Looking for some help on how to fix this because I’m tired of my car being slow and preforming so poor. It’s a 2007 cobalt ss (2.4L)Awhile back I managed to entirely mangle a connecting rod from hydro lock going through a flooded street, when I took it apart to replace a few little chunks of the piston, after I put everything back together it had the crankshaft pos code and ran almost as if the timing was extremely retarded with not a lot of power, and the tachometer did not work. I replaced the sensor but it didn’t change anything , thinking it was the reluctor ring I got a almost new engine out of a cobalt that had been written off in a rear end collision, but once it was back together the rpm gauge worked but everything else was still the same and the engine light stayed on . After a week the rpm gauge stopped working again. I’m not sure what could be causeing this anymore can anyone give me any information at all??
 
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