Recently had a rebuilt tbi 305 dropped in my 89. Running as if it has a crazy cam motor rocking all over place, fuel out the tail pipe. Service Engine Soon light is on, code reads that its a MAP sensor new map sensor on it so can not be that. Car sat for 3 years but drained most of gas out and put new in with some seafoam for injectors. Could it be a bad map sensor, there is a mild cam in the car but would not cause it to tack out like it does cam did not require chip. As soon as it starts up it tacks all the way out on dash but engine starving for gas it seems. Good oil pressure when driving but idle its up and down. Speedometer somewhat works but not entirely accurate. Any help would be greatly appreciated.