If your truck is too new, that will only increase the problem.
try to find the mis fire like you said, but instead of just disconnecting the plugs one at a time, take the plug out, ground it to the block and have the wire connected, there should be a bright blue spark, a yellow or dim spark is a sign of weak spark ad cold be the missing.
if the spark brain is bad, it will cause the truck to mis fire spastically, with no rhyme or reason.
if this does not solve he problem, check for cracks in the distributor (if you have one).
make sure everything is 1-dry 2-clean
if it does solve the problem, after you get it running right on a dry day with the engine hot, and running, spray some silicone sealant on everything electric, and let it dry totally before shutting off the truck.
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Check the VVS (vehical velocity sensor) "speed sensor", The vss controls shifting and cruise control as well as speedometer. If the Cavalier shift's fine and cruise control work, the it's going to be a good chance that the speedometer n the instrument panel may have a bad connection or the stepper motor needs to be replaced. Get a service book and attempted to check for voltage going to speedo cluster( at dash), to determine if your stepper motor is bad and replace the motor or the whole instrument panel. Good luck and thank you for using fixya.
One of the coil packs are starting to go out. One way you can pin point it is to buy one coil pack and replace one. If it still misses keep moving the spare one to the next coil pack until you find it. If you take it somewhere to be fixed it will run about $275 for each coil pack and up from the dealer. If you do it yourself and some time cost will be $70 for a coil pack. I know cause I just went through the problem at 120,000 miles.
a bad tps sensor will cause: transmission shift issues, bucking, jerking, idle surging, engine cutoff, hesitation on takeoff, surge while cruising down highway. to check, remove connector from tps, use a ohms meter and probe center and any one of the other connectors,move throttle slow. if it jumps or does not stay steady while moving throttle, its bad. if the needle on ohms meter moves good then the tps is ok. move throttle plate slowly.
4.2 ltr missing. 2000 truck, f150. Changed plugs, wires. Ran great for 2 weeks. Started again. Changed coils. Got worse. Changed fuel filter, did nothing. Added injector cleaner and fuel cleaner, nothing. Checked EGR, o.k. It is getting worse. Had new gas about the time it all started.
good chance you may have a bad coil, you can check by disconnecting the plug wires at the coil to see if your getting any spark, if your not seeing any spark when car is running your coil is bad. be sure to do disconnect the plug wire when engine is not running and key is off!
New coils run around $26.00 easy to change out, you only need a nut driver, 2 small bolts.