Miss fire

2002 PONTIAC GRAND AM
165,000 MILES • 2.5L • 4 CYL • AUTOMATIC
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DIVERMEDIC06
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670 miles ago I had work on my car and the cat was changed. I changed the spark plugs today went for a drive stopped at the store it was running great till I got back in the car and it starts to miss fire like once before
Apr 20, 2016 at 8:41 PM
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HMAC300
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misfires are hard to find check for vacuum leaks, fuel pressure, and compression. then have it scanned auto parts can't read what needs to be so a mechanic will have to do it. you said it misfired prior to replacing plugs. so it's something else.
https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator
Apr 21, 2016 at 6:17 AM
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DIVERMEDIC06
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Well my neighbor put scan to it and it came back approved no codes
Apr 21, 2016 at 7:21 AM
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DIVERMEDIC06
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When I start the car it will idel hard and if I turn the air con on it will die
Apr 21, 2016 at 7:25 AM
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HMAC300
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if there areno codes there is not a misfire if there was it would show it via code. check for a vacuum leak and fuel pressure.
Apr 21, 2016 at 8:22 AM
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STRAILER
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Hey Divermedic06

When you changed the plug did you do the plug wires as well?
Apr 21, 2016 at 5:25 PM