Re: 91 Silverado TBI problems
Hey, it sounds like its running really rich, which you probably already know. Definitely can be the o2 sensor or map sensor. It could also be the coolant temp sensor also. Quick checks you can make are checking the connections and related wiring to those sensors. Make sure the map sensor vacuum hose running from the throttle body isn't cracked and leaking. After that I would invest in a data reader so you can see what the sensors are doing. Also I have seen ignition modules cause funky drive ability issues on those. Good luck.
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