car missing bad poping out exhust

[billyfarmer]

really bad miss i seams like ignition problem i changed plugs changed fuel, possible ignition wire beong to small,
i havent changed distribitor yet any sugestions

[BLOWER]

check the battery

[C10]

need more info! MSD? Stock? what is it??

[merc123]

Could be a ground issue or even the switch.

[sea_bee77]

i had same problem last season. sounded good in the garage but when i hit the track it started popping like crazy. i changed everything from battery, spark plugs , distributor, fuel pump, and it ended up being a problem in the carburetor. bad power valve. sucked i chased the problem for a month

[boogityk5]

Possibly worn cam lobe?

[dirty white boy]

Possibly worn cam lobe?
bent push rod,..rocker backed off....

[brad hibbard]

bent push rod,..rocker backed off....

agree with last two posters----pull the valve covers and make sure everything is good there

[3dinter]

agree with last two posters----pull the valve covers and make sure everything is good there
i agree to the last few posters, i had a stock rocker stud pull out. We always use screw in studs / guideplates from then on, a lil insurance.

[DANNY]

I agree with all the top and add... Had carb blockage it popped, had fouled plugs it popped, adjusted valves wrong it popped, and the one that takes the cake:

Somehow some metal got into the distributor and under the rotor on the magnets HEI SYSTEM and was shorting out under there it was a disaster took a day to find it...

good luck hope you get it let us know

Danny

[sj valley dave]

We had a phantom missing a couple of years ago...Tried all the standard fixes, cap, rotor, plugs, coil, ground, different carb, etc...including re wiring, switches, etc...Ran a local race, no misses...towed 280 miles one way, came out of the trailer, popping and missing...At the start of the main, started popping again, came into hot pit area and I accidently nudged the MSD box and the car died...re fired the engine and when I wiggled the 6ALN box the car crapped all over it self...sent box back and could not fix, replaced the box and never had another issue since..LOL Now we run 2 complete ignition systems with separate MSD boxes and coils...

[DANNY]

Lol I forgot you told me about that...

Heres one have you put in a diff distributor?

[17WCREWCHIEF]

Had the same problem last year. changed plug wires and still had the problem then it mysteriously disappeared the next weekend all I did was change the plugs and it came back. Found out that it was a bad connection in one of the plug wire boots. Get some good wires like taylors.

[smokey 4 president]

Chased that problem few years ago. Changed everything imaginable. Sounded fine in garage and hit track and kept popping. Ended up being water in fuel.

[Dirtman29]

Have you compression tested the motor? I had a bent valve years ago, sounded fine in garage but hit the track & it wouldnt run for $hit. Took 3 weeks to find out what the cause was.