NEED HELP going crazy on a 302EFI

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Mar 3, 2005 | 08:17 PM

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From: Gulf Shores, AL

NEED HELP going crazy on a 302EFI

OK guys I am at a loss and it is driving me crazy. I recently put a rebuilt roller 302 out of a MAP EFI mustang into my 91 F150 EFI. The motor was rebuilt to stock specs for the mustang than I aquired it. I swapped the cam for a truck roller cam that Crane more or less designed for this swap. (that is what the crane cam tech guy told me). My problem is that when the truck hits about 3 grand and above I get what seems to be a really really really bad miss. It almost sounds like it is hitting a rev limiter. I have plennty of fuel pressure new injectors (19#/hr) new fuel pump relay and the timing is dead on. The plugs are burned perfect. I did use all my trucks fuel injection componets. What gives. I am getting a code that says my ECM memory loss or something to that effect. The motor runs great from idle up to 3000 most of the time. Sometimes at idle it runs really ruff then will clear up as soon as pull away from the stop. I have tried troubleshooting this thing with no luck. ANY HELP WOULD BE APPRECIATED.