1990 318

I have a 1990 Dodge D-150 with a 318 throttle body. I idles fine and runs fine while setting still, and putting around town for short distances. The problem when trying to get to hwy speed it falls on its face and will not accelerate (will spin the tires setting still). It throws a MAP sensor code, but the sensor checked out fine and replaced it twice. We have put a set of injectors in it and a new throttle body on it. The brakes aren't locking up and the transmission shifts smooth and good.
Any ideas would be great!!!
Thanks!
Author: admin