Have been chasing a intermittent issue with the TJ for years, maybe 10! Occasionally after a start when hot (after a fuel stop) It would start rough and throw a 303 code, #3 misfire. Over the years I've replaced Plugs, Wires, Coil Pack, OPDA, Cam Position Sensor, Crank Position Sensor, Fuel Injectors and all the heat shields. The problem would go away for a while, only to return!
Last week it returned. This time it was hard to start, would not accelerate, was back firing, very unhappy! After a few minutes it settled down and was running fine, although I could tell the performance was lagging and the fuel burn was above normal.
This morning I went to NAPA and purchased a Fuel Pressure Regulator. $200.00+ retail, I think I ultimately paid around $175.00 with the combined discounts I was able to muster. It took me about a hour and a half start to finish. Not to bad! Having a floor jack and a motorcycle lift to aid with holding the tank made the process pretty simple. 4 screws, 7 nuts, disconnected two lines, removed regulator, installed new, re-connected the lines, raised the tank, installed nuts and screws and all systems seam to be happy! I guess only time will tell. Will be driving it to Tallahassee Sunday, that will be the true test!