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Engine runs when there's a vacuum leak, but stalls out when leak is stopped.

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Old Jul 13, 2025 | 10:42 PM
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Default Engine runs when there's a vacuum leak, but stalls out when leak is stopped.

1990 Jimmy (Full Size) won't stay running. I disconnected the vacuum line from tbi to the EGR solenoid and it runs. The EGR solenoid seems to be functioning properly (power opens valve, EGR gets vacuum). Currently have it connected to Snap-on Solus scanner, but it says "no connectivity". Any advice is appreciated.
 
Old Jul 19, 2025 | 06:27 PM
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The scanner cannot connect to the engine computer or there is an EGR issue?

George
 
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