for me it was a small rubber elbow that connected one of the vacuum hoses. It was a $2.00 part at Checker.
Check for a vacuum leak.
One transmission that will fit a 1991 Chevy Suburban is a 4L80E transmission.
Suburban Commando was created on 1991-10-04.
700R4
NO.
You can find the wiring diagram for a 1991 Suburban at various auto part stores. You can also check in the owner's manual.
Try checking the fuel injector and carburetor
NO.
5x127
According to IntelliChoice (see links), the curb weight of a 1991 Chevrolet Suburban K2500 is 4,540 pounds. The gross vehicle weight is 8,600 lbs.
Suburban Commando - 1991 was released on: USA: 21 June 1991 (limited) USA: 4 October 1991 Germany: 31 October 1991 Spain: 20 December 1991 UK: 20 December 1991 Ireland: 9 January 1992 Australia: 9 April 1992 Hungary: 23 April 1993
it could be a bad vacuum line or it could be the the throttle position switch