I have 92 4.9l .
My problem: Surging/Stumbling/Hesitation upon light acceleration.
What I have done so far:
replaced bad/old vacuum lines
cleaned TB blades and egr tubes
got my hands on a data reader
had a intermitting signal from the map. connector was not tight.
information I have:
when the engine starts its Surging/Stumbling/Hesitation routine I noticed that my left bank injector pulse time is flucuating. The right bank stays constant or smoothly increases as I accelerate.
1. What controls the injector pulse times?
2. Which is the left bank?
3. What else could be causing the Surging/Stumbling/Hesitation