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Re: check engine lamp
stethoscope may work. You can use a piece of vacuum line in one ear and cover the other or use an ear plug.
Propane should work. Watch A/F and RPM, listen for sound changes.
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1970 C20 Custom Camper - 350, TH350
1997 GMC Suburban
1994 Acura Integra GSR
1987 Dodge Daytona Shelby Z
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