89blackonblack

installed the gt40 ford racing engine had it tuned and drove it for about an hour without a problem and then went to take someone for a ride and stomped on it and it started lagging then did it again... let it cool down a bit took it out again and was fine at first then started doing the same thing... what could it be?

mattdel

if it's fine after you let it cool down, its probably the ignition module. could be the coil, or the PIP, but 90% of the time, its the ignition module. $25 part, easy install.

mattdel

then again you could have fuel delivery problems and it's only co-incedental that it happens that way.

does it only "fall on its face" while you are accelerating straight line hard, and/or around corners hard?

89blackonblack

i they went through the car installing it.. just frustrating thinking the car was fine and it ran like a bear for about an hour or so then it did that

89blackonblack

straight line at about 3500 and it get worse after.. at first you can barely feel it but then you get on it again and it gets worse and worse everytime

mattdel

so your saying you can still feel it, even when your babying it?

89blackonblack

no it is fine when you are driving it normal... it did it the first time after i drove it for about an hour or better and i was on the dyno and was fine... i brough it in the garage checked the cold air intake connections thinking maybe something came off or lose then let it sit for about an hour... started it back up and it was the motor was still warm let it run for a minute then took it for a ride... at first it ran like a bear then about three min into the ride i jumped on it and i could feef it stop pulling a little bit at full throttle and high rpm then jumped on it again and it fell on its face more.. then i did it again and it fell on its face

mattdel

yup. fuel delivery. did you upgrade the fuel system? i think those motors come with 24lb injectors, so a bigger pump would be necessary.

also, your fuel tank baffle could be broken and not holding gas around the pump. is the tank full?

89blackonblack

yup went with a 255 fuel pump 24 lb injectors and the baffing was broken in my tank so they put a used one in with good baffling

mattdel

well your problem sounds like another broken baffle. happened to me, same problems.

why would you go through all that money on a new motor and everything, and skimp out on a used fuel tank. they're only $100 new.