Car misfires....please help

[96floridacar]

I have a 96 GT Convt and I just got the intake changed because it cracked. Ever since I got that changed, the car is running real ruff and doesn't have any power. The check engine light flashes on and off constantly. Its my only car so I've been able to drive it to work but it is very hard to do cause it idles very ruff. The guys at AutoZone used their computer and it came back misfire on plug 7. What could be the cause of this? It used to run great. It has 127,000 miles on it.
Any suggestions?

 

[96WhiteNight]

Just the plug wire first of all then pull the plug out check the gap and stuff. Then if that fails take it back to who ever did the intake swap and make them fix it.

 

[96floridacar]

It was a shade tree mechanic who did the work and he is telling me I need to install a new head gasket. I don't think thats the problem because it did this about a year ago and a reputable shop just changed the pcv valve and it fixed the problem. I tried it myself and it still runs poorly. I hate to take it to a shop and be at their mercy.

 

[sbelyo]

Just check and change the plug first. The plug wire could have also worked it's way loose. If you haven't changed the plugs or wires lately, now's the time.

The check engine light will come on for a mis-fire.

I doubt it's a head gasket. You'd be seeing smoke from the exhaust, and maybe oil in the coolant.

 

[96WhiteNight]

Just check and change the plug first. The plug wire could have also worked it's way loose. If you haven't changed the plugs or wires lately, now's the time.

The check engine light will come on for a mis-fire.

I doubt it's a head gasket. You'd be seeing smoke from the exhaust, and maybe oil in the coolant.

I agree

 

[96floridacar]

I'll check the plugs and the wires. One bad thing is I do see some smoke out the back when I first start the car then it stops soon after. Thanks for your help.

 

[Roger_4.6_96]

Did you happend to get coolant everywhere ? If so look in your spark plug holes.

 

[96floridacar]

Yes, I noticed that there was coolant around the plugs and all over the engine. I've stopped the leaks but now it runs crappy.

 

[Team801]

Did you change your plugs yet?

Thats what I would do if I was you and also change the wires.

 

[97gtblue]

check for a vacumn leak

 

[d98gt]

When my intake finally cracked, the coolant ended up getting into the plug holes which caused a wire to screw up.

The wire was sparking off behind getting to the plug and I noticed this at night. I replaced the wires/plugs and it fixed my problem.