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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.

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โˆ™ 2015-07-16 19:30:18
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Q: If your 1989 Camaro 5 7 TPI misfires after the temp comes up what would cause this?
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