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Re: 91 Silverado TBI problems
91 TBI should have an ALDL port to check for codes. Granted its ODBI but if the map or O2 sensor is dead it will flash out a code. Make sure the vacuum line for the map sensor hasn't cracked and isnt leaking. Another fail that's hard to find is failing fuel pump relay, the old ones can quickly cycle on/off causing all kinds of havoc. It is the same as the AC relay and can swapped to eliminate systems.
Good luck.
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