- Feb 8, 2018
1993 Mustang LX 5.0 manual. This is my son’s first car. It is a father/son project. It was wrecked in the front pretty bad when he bought it. We restored it ourselves and it is his daily driver. It was said to been bored .40 over. No records provided of build. It runs and idles well. The problem is when we floor it, it is fine through first gear into second. At the end of second, it will instantly kill. Then usually a brief check engine light followed by a backfire. Then it resumes as normal. We were thinking it was a fuel problem and replaced the fuel pump with 225lph. Replaced distributor because it died out of the blue on the road and left him stranded. Replacing that fixed the WOT problem. It ran very well. Now 4 months later it is dying at WOT again after 2nd gear. We are thinking it could be the distributor bottoming out onto the oil pump and may need to be shimmed? The timing is correct. There’s no break up before it dies. We just can’t find any info of anyone having this problem. We can’t understand what would cause it to need a new distributor so soon and why it doesn’t cut off in 1st gear at WOT. Only at the end of second. If we baby it through second, the hit it again, it will die at the end of 3rd with same brief check engine and backfire.