Do you have a check engine light on?
SOURCE: Audi A6 Misfires
You may have a coil pack going bad. They're on the front top of the engine - you'll see them if you follow the spark plug wires back. Do you have any codes from having the engine scanned? If you can get it scanned (AutoZone will do it free), post the codes up and we'll see which cylinder(s) are misfiring. From there, you can swap coilpacks around and see whether the misfires follow the packs or stay in the original cylinders. If they move, you have a bad coil pack or two. If they don't, since you've already changed plugs and wires, I'd see about having the injectors diagnosed to see if any of them are failing.
SOURCE: 1982 Fiat spider 2000 pininfarina.
This sounds to be a problem with the ignition module. The module might produce a fairly nice spark at an idle, but at higher rpm's the spark should intensify, if it doesn't then the car will not run at a higher rpm.
SOURCE: misfiring
Well there are several things that could cause this problem...
1. one of the coils may not be firing.
2. the ignition module could be bad.
3. the mass air flow sensor could be tellign the car to run rich (too much gas)
4. if the car is equiped with a map sensor it could do the same as a mass air flow sensor.
5. fuel pressure regulator could be leaking at vacuum port drawing in more fuel than needed.
6. the computer itself could be bad as well.
The car either has a map sensor or mass air flow not both. The mass air flow would be right after the air cleaner housing usually a 4 wire connector. map sensor is normally located on the rear of the upper intake manifold with 1 vacuum line going to it with 3 wire connector. Hope this helps.
SOURCE: 01 Chevrolet S10 Blazer hesitates/misfires
If it is only doing this in overdrive lock up, tap the brake if it quits see a transmission man your torque converter might be bad
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