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97 cavalier, valves clatter, power loss, engine chugging
About three days ago my 97 cavalier auto (think its a 2.2), 192K miles began running rough, "chugging" between 500 and 1000 rpms when stopped at a light. When I accelerate, there is a notable loss of power and the valves clatter unusually loud around 3000 rpms. Changed all 4 plugs, (they were BAD). It ran great for about two miles until I stopped when "chugging" and power loss resumed. I deliver pizza but do not drive it hard, tips are good enough without ragging on it. SHould I bother with plug wires or any ideas on other possible causes? BTW: Engine was alegedly rebuilt at 130K miles.
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