its a pickup 87 the engine is z24 8 spark plugs. And i don't think so the timming was a problem because it began to fail suddenly. I moved the timming but the problem did not correct. I think the problem is in the head gasket i'm gonna to change it. you know where i can find diagrams of hose vaccum and timming order to putoff the spark plugs wiring. and all necessary for put off the head. remember my engine is a z24 8 sparg plugs.lshadoff said:It sounds like your car needs the ignition timing checked. What kind of car/engine is it?