Its a 98 grand prix gtp, i pulled all the plugs and they look the same nice and new no coolant or gunk on #4. The codes that are coming up are cylinder 4 misfire which has been there for a while, long before it started acting up, and one for not having a cat, i just ordered a 02 sim so not having a cat shouldn't be a problem once i put it on. The miss is only noticeable when the motor is cold but i loose coolant really fast and i have a new radiator so head gasket is all i can think of for that issue. I did put headers on it then my radiator blew up and 2 or 3 days after replacing it it started running like crap after i start it. The intake starts sucking in air, really loudly, and it just boggs down for about 4 minutes then levels back out and is fine. I also replaced the MAF and thermostat. The car is at my friends shop right now and he said it seems like its the head gaskets which would cost $1550 to fix thats with a valve job machine the heads and block. I really dont want to pay that much if it is something else tho.
