Jumped time timing off.
You have to remove the intake manifold and be care full of the crank sensor
In the oil pan
It's lean.
may have plug wire crossed
1 5 3 6 2 4
If a 1989 Suburban hesitates when accelerating from 45 miles per hour, the carburetor might need cleaned. A clogging can cause surging and hesitation.
Its screwed into the upper intake manifold on a 1989 ( somewhere ! ) 5.0 L
The gasket is between the head and the intake.
adjust the timing or use better grade/octane of fuel or both
rear tire wall under car tw mills
on top of the intake
Above, it is behind the valve cover.