[robmustang66]

So usually on my first or second drive of the day (after my mustang warms up) i start to get a lot of misses and backfires. Usually when i give it gas around 1500-2000 rpm, (and almost always in 3rd gear). It misses 2-3 times then is fine until i shift. My check engine light is not on (but then the only time it has ever come on is when i start the car and all the lights do their check). In the past year I've changed the coil, cap and rotor and cleaned the MAF. In the past 2 years I changed the fuel filter, plugs and wire. A buddy said my wires might be crossfiring? And he also shocked himself when checking to see id the plugs were secure on the distributor while the motor was on. Is that normal? Kind of a lot there but I hope it helps.

[Scottyohh!!]

Its not unusual to get shocked while handling the wires on the distributor while the car is running...Every mechanic on this site has done it at one point or another, it sucks!

Seems like your problem is during low RPM, high load conditions.... Check your plugs, look for carbon build up. Also check to be sure that they are gapped properly, with the mods you have you could probably stand a couple thousandths more gap than stock.

Where is your timing set at?

What kind of tuning has been done to accommodate your upgrades?
I would think that you should be running a higher than stock fuel pressure and more than likely should have 24lb injectors for your setup.

Also, your exhaust is a little big for a smaller cubic inch motor without forced induction.

[windsor504]

I had that problem a few weeks ago... Timing was off, and my EGR was bad.