I was driving back to Montana from Denver this week and when I hit the hills and the tranny shifted down and was over 3K RPM the check engine light would flash on then off three or four times, it didn't stay on and there were no engine codes in the computer, truck runs fine. This is a 94 F250 5.3 gas engine. I have recently replaced the fuel pump and the filter and had an injector replaced on warranty. Has about 85K miles. any help appreciated, Larry

 

94 f250 with what engine?