mine has started to miss under mild acceleration, hard acceleration it seems fine, runs smooth at idle, normal take off it has a bad miss you can feel not just hear, just started, carb is 1 year old, new plug wires installed yesterday,didn't help, has a pertronix ignition but it is close to 10 years old, never heard of these going out or what symptoms when they fail, spark advance is working,also mild backfiring thru exhaust when it is missing, it sounds like the carb to me but it was not a gradual problem, it was fine, stopped at red light, took off and now missing, since its intermediate it would think it is electoral instead of mechanical, a coil problem would still miss under hard accel. wouldn't it? cheaked for vacuam leaks, all lines are connected,fuel pump replaced about 2500 miles ago, any ideals?
I know on a car that burns a mild amount of oil, the spark plugs can become slightly fouled out by oil and "miss" occasionally. This happens on my 1976 4-door. I clean them and it purrs like a kitten for about 3000 miles.
Had a 1968 Galaxie that had those SAME EXACT symptoms and it was the Fuel Filter was stopped up. Check the fuel filter if not that I would say it is starving for fuel under normal/mild accel. and when you really kick it whatever is restricting the flow is opening up again. But Check that Fuel Filter first. Mine drove me crazy replacing points, coil, changed the timing, couldn't figure it out until it blew the freaking muffler open like a can of pork-n-beans and for some reason that just struck me as it starving for fuel and I checked the filter and it was stopped up bad. Easy/very light, acceleration it was fine, would get enough fuel to motor along, hard acceleration I guess the fuel pump was pushing past the stoppage but mild acceleration, it would miss and pop and backfire horrible.
theres a good chance that a carb rebuild will fix it. dont know what type of carb you have to offer specific areas to look at.
Damadman and Earl: Good call , bought a filter and some plugs, was going to do them at the same time but after filter installed decided to crank it for a second so I would know which if ether fixed it, I knew immediately it was running better, took it around the block and it is fixed! Thanks guys, motor was too hot plus I was too relived to continue with plugs so that will probadly happan this weekend! Craig: How did you know it burnt a mild amount of oil! LOL That was a good call too! Bryant: I really was worried it was going to be the Carb,I bought a rebuilt one from major auto store @ a year ago but have never been happy with it, I think the accel. pump is already going out Thanks from me and the Grabber to all who responded!!!
Owner's manual says to expect to use a quart of oil every 700 miles. My car uses one quart about every 500 miles, so it uses a little oil.
Awesome I am glad that fixed the issue. i know it drove me nuts replacing stuff the first time it happened to me and it turned out to be a dang $2 fuel filter.
