I just bought a 1990 Dodge w 150 truck. When I try to accelerate I have a dead spot in the pedal. The truck will rev up and die off over and over again. At first I thought it might be a Manifold Absolute Pressure Sensor. After I replaced that i found that the problem is still there. I am now looking at an O2 sensor or a sticky injector. Does anyone have any suggestions or ideas as to what might cause the dead spot and the lunging.

 

might sound stupid but did you try un plugging the battery, letting it sit overnight and plug it back in in the morning?

 

Check for codes, check your fuel pressure.