It is probably plugs. I suggest a good tune up. GoodluckJoe
It could also be a SMALL Vacume leak that shows up when everything swells as it heats it. (use Vac guage to check, also wires and plugs are a good bet)
Just a thought: If I remember right #5 and 7 fire back to back. You might try looking to see if those wires are in contact with each other. If so, either darken your garage or wait till nightfall and watch for arcing between the #5 and 7 wires where they come in contact. If the wires are "bad" #5 might be advance firing #7 causeing your "miss". Check your radiator for oil and oil for water. with radiator cap off see if pressure builds up, like alot of air if it does build up pressure you either cracked a head or head gasket causing it to apear as a miss insted of a dead cylider. you don't have to wait till dark you can simply hear it doing this. it will make a ticking sound if it is an arc and the solution will be to replace the wire. if you want to find out which cylinder is At Fault remove one wire at a time and crank engine. when thre makes no difference in engine idle with wire on or off you located the cylinder at fault.
incorrect engine timing so that it misfires
Mechanical issue, ammunition issue.
Wiring and internal engine problems can cause misfires.
In theory, it could, but in all practicality, it would not. The four main causes of misfires are faulty sparkplugs, bad spark plug wires, bad fuel injectors or a loss of compression.
Your 1996 Pontiac Grand Prix will experience cylinder misfires when one or several of the spark plug wires are bad. A bad spark plug can also cause the problem.
That would be the 4L60E
Wet/damp/faulty ignition wires, contaminated fuel (water), worn out spark plugs.
burned rotorbug
try turning on the fan switch in the car
a plug misfiring would cause the rough idle and check engine light or if u changed the plugs and wires u could have put the plug wires in the wrong order
Yes, as the mixture would run lean and possible misfires could occur.
The most likely cause would be a vacuum leak at the rear of the engine or a defective selector switch.