I would think the coil may be suspect a well as the connections to it.is it standard ignition or electronic?
Spark plug gap according to Champion Spark Plug applications list is .044
.035 inch
.030
.045
.035 - .038
.035"
0.8 to 0.9 mm
That would depend on which engine size you have
Well start by changing your regular spark plugs with performance plugs and also change ur plug wires too, try performance plug wires. Get a after market cool air intake.
1-5-3-6-2-4
1000 ohms per 12 inches.
The spark plug gap for the 1987 Chevrolet S10 4-wheel drive pickup with the 2.8 liter TBI 6-cylinder engine is .045 (in thousandths of an inch). The spark plug tightening torque is 7-15 foot pound.