Rough Idle
08-28-2014, 08:45 PM
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Car: 1989 Formula Firebird
Engine: 305 TPI
Transmission: 5-speed
Axle/Gears: 3:45
Rough Idle
I have an 89 formula TPI 5 speed, just had someone change the plugs, wires, cap and rotor. AC Delco plugs, autolite wires and stock cap and rotor. It ran terrible after they were changed, 2 of the plugs were not gaped right on the driver side so the mechanic re gaped them took the car for a ride and it ran a lot better but there is still a miss at idle. I think he gaped them around 0.42 but didn't check the gap on 2 of the plugs on the passenger side. Not sure if I should get a new set of plugs and have them changed or could it be a separate issue? Any ideas let me know. thanks!
08-29-2014, 06:37 AM
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Car: 1986 Monte Carlo SS Aerocoupe
Engine: L69 305 H.O.
Transmission: 200-4R
Axle/Gears: 3.73
Re: Rough Idle
I guess it could be incorrect gap. I think factory my car calls for .35(89 tpi 305) the decal under hood says so. Could be a cracked plug, or wire not on completely or first thing I'd look at are wires on correctly in firing order? A crossed up wire will make it run like anus
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