I have a 87 olds Calais - engine light came on, I put tester on the car and replaced EGR valve, O2 senser, MAF, plug wires, new plugs. Car still idea's ruff and backfires in back muffler (many short backfiles). I didn't replace the senser that is contected to ERG. Any help would be great
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Monday, September 26th, 2011 AT 3:16 AM