i got my 1992 se max and it wasent runing fast enough so i thought i would change the spark plugs. so i change them to ngk platinum and it ran really good when i floor it the tires would schreech the car would go really fast but then after an hour it went back to the way it was b4 i changed the spark plugs. when i floor it, it hesitates and then it goes
can any one help me out with this problem ?????
tanx -mike

 

Did you do a full tune-up? Changing the sprak plugs is not a full tune-up, if you didn't give it a full tune-up you should change the fuel filter, pcv valve and air filter. Other possibilites could be that the MAF sendor could be bad. Very hard to judge a problem when not looking at it directly.