[patrickjudkins]

i just posted below on an overheating prob here is another problem we have had for over a year on the same car...its a 2003 pt cruiser gt and its been misfiring for a long time now, it shows the code p 0304 which is random misfire on the 4th cyl... here is what ive tried, replaced spark plugs(3 times all different types) replaced the coild box which sparks to all 4 cyl, ive tried replacing the spark plug wires, ive cleaned the number four injector and even swapped it with the number 1 injector. what am i missing here i thought i had covered all the grounds, ive even gone so far as to pressure test the number 4 cyl as well as the other 3 cyl's all have good pressure so head gasket isnt blown no bad rings i cannot find anything wrong, ive tried additives for injector cleaners, paid 89 dollars for a real intake system clea, took the exhaust manifold off to see if maybe sumthing was blocking the exhaust tube for the # 4 cyl, did the same thing with the intake, changed air filter, we only run premium gas because thats what it calls for, i just cannot figure out what it is, neither can any shop ive ever taken it to... we see about 16 miles to a gallon on the freeway at 70 miles an hour and the car shakes so bad when your sitting still it almost makes sick, and is almost embarrasing to sit at a light cuz it is so obvious that there is a problem. we will be leaveing on vacation in 8 days and gone for 2 weeks i dont really need this fixed too badly but would like sum input on it. also id liek to add that the car is bone stock not a single thing has been changed and also the headlights and dash lights dim and brighten with the misfire of the motor, every time it misses the lights dim. please help