Adjust your timing
No, It sounds like your timing is off or your firing order is wrong.
About 15 mpg on a 1990 Chevrolet suburban.
1990 Chevrolet suburban gets about 15 mpg.
Timing is off.
NO THERE IS NOT
Yes it will, I own a 1990 GMC Suburban 2500 (3/4 ton) and it came from the factory with a 454 motor.
In the throttle body.
no. throttle body
http://www.alldatadiy.com/
your alternator is not charging
by wackin it ;)
R 12 refrigerant.