OK I noticed during my latest datamaster run, that on load with rpms going up and speed going up, and a steady throttle postion.

My MAP reading was going up then dropped from like 75 to 48 and stayed there, this is also the exact time my stumble I've been trying to fix happens. What could be causing me to loss Pressure in the Manifold on load, a missfire wouldn't cause this would it? But if I have a leak that happenes and more air is getting in unmeasred then that could cause too much air,.......

Anyone got an idea???

 

TTT

 

Easiest way to check for an air leak, is to start the car with the hood up, walk around front and put your ear right up close to the intake plumbing. Listen for any really loud, very obvious whistling or leaking sounds.

 

the MAP reading should be very close to true barometric reading at WOT. so check WOT and see if the MAP fluctuates any and that should give you a good idea if its functioning properly.

 

That's part of the problem I can't go to WOT without the car Crapping out, anything above 3000rpms and it's not good.