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Please help I've got a 79 f150 with 351w that was running great then just started missing the other day. I did a full tune up and no change. Checked for vacuum leaks and intake leaks haven't found anything im stumped
I pulled it out shook it and heard the ball going back and forth. Did notice when it was not in the valve cover the engine sounded slightly better but nothing I would call a remedy
EGR valve, not the PCV valve. You pulled the PCV valve from the valve cover. The EGR is the big round one behind the carb with a small vacuum line going to it.
did you do anything to it before is started missing & did lights or anything come on? An does it miss all the time at idle & driving or just while driving?
i would check your slop in the timing chain, if the enginge has relatively high miles thats a deffinate possibility. remove the cap from the dist. place a socket and breaker bar on the crank, turn the breaker bar until rotor turns then turn it the other way until it moves again. the amount the breaker bar moves between the movements of the rotor is the slop.if it moves more than 3-5 degrees you might want to think about a timing chain being the problem.
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