Idle Problem!

[Fireball_Raven]

The car is a 79 ford mustang. I replaced the camshaft timing gear after the teeth all sheered off and also the carburator and the tightened down the rocker arms cause they were loose and sloppy. It has the V6 171c.i. engine with an automatic tranny. Now for the problem:
It idles erratically, misfires, idles really low when you put it in gear and sometimes you have to hold the gas peddle down to get it to start, and will die sometimes while in gear and idling.
Right now I have it idled up to get it to stay running but it still does all of the things listed above. I can't figure out whats causing this, the timing marks on the gears are perfectly aligned, the rockers are set to spec, and the distributer is original but where it should be. I do think it might have a miss though in the #4 cylinder. Sometimes if I pull the spark plug wire for the #4 cylinder sometimes it'll die sometimes it will keep running the same. Also when shutting it down, sometimes it continues to fire or try and fire once or twice after I've shut the car off.

[Silver Fox]

Originally Posted by Fireball_Raven

The car is a 79 ford mustang. I replaced the camshaft timing gear after the teeth all sheered off and also the carburator and the tightened down the rocker arms cause they were loose and sloppy. It has the V6 171c.i. engine with an automatic tranny. Now for the problem:
It idles erratically, misfires, idles really low when you put it in gear and sometimes you have to hold the gas peddle down to get it to start, and will die sometimes while in gear and idling.
Right now I have it idled up to get it to stay running but it still does all of the things listed above. I can't figure out whats causing this, the timing marks on the gears are perfectly aligned, the rockers are set to spec, and the distributer is original but where it should be. I do think it might have a miss though in the #4 cylinder. Sometimes if I pull the spark plug wire for the #4 cylinder sometimes it'll die sometimes it will keep running the same. Also when shutting it down, sometimes it continues to fire or try and fire once or twice after I've shut the car off.

Was it doing any of these things before you had the problem with the cam gear.

When the gear sheared off did the engine continue to run for any peroid of time. If so you may have bend or damaged one or more valves. If the valves are not seating all the way because of damage, it would cause it to backfire through the carb and or out the exaust when the spark plug fires.

I would get a compression test done on all 6 cyl. to see if you have valve blow by.

You may have to have the head rebuilt.