88GT_5.0Stangman

i recently converted my 88 5 speed 5.0 to mass air i have a computer out of an 89 5 speed, brand new pro m 75mm meter, brand new harness and a bbk fenderwell CAI. i also have a b cam
my prob is that when i first start my car it will die unless i keep hitting the throttle it takes at least 5 min of this before it will idle and somtimes it will idle for 30 sec and die. after i drive it say 10 min or so it will stay at idle. if i put it in gear and drive the car will buck and pop a bit. the car started and idled fine befor the conversion
any sugestions on this??
thanks

yzfr6i

Did you change out the MAP sensor on the fire wall? I know the speed density cars have a hose running from the upper intake to the MAP so it can read engine vacuume. The mass-air cars don't have the hose and it looks like the sensor is blocked off where the hose would go. On a mass-air car I believe the MAP reads the barometric pressure in the air. I can't say for sure, because I have worked more with S/D than M/A.

88GT_5.0Stangman

yeah i got a new intake typhoon and there is no hose running from the intake to the sensor any more it was the sensor that cam off the 89

silver91gt

did you get an adapter thing that goes between your stock wiring and the computer with the mass air wires on it?
or did you just switch the whole wiring?
if you kept the stock 88 wiring you need to change the locations of some of the wires in the harness that plugs into the comp.

88GT_5.0Stangman

yeah i had the whole diagram of which wires to swich i checked it like 3 times

FastFox

is your mass air calibrated to your injector size?

Tims 88GT

check for vaccume leaks, and the map sensor read manifold absolute pressure on a SD car, im not shure what it dose on a mass air car.