GM Technical Service Bulletin #77-63-06Ab states that: "stalling, hard starting, and hesitation are symptoms of a failing PMD (Pump Mounted Driver)(also referred to as the "Fuel Solenoid Driver") module." These symptoms usually (but not always) set a code 35 or 36 in the 1994 - 1995 models, or a code 1216 in the 1996 - up models. Often when this problem is diagnosed at a dealership or repair shop, the customer is told that the injection pump needs to be replaced. But in most cases, the PMD module can simply be replaced for a fraction of the price.
Resistor Number Fuel Delivery Reference (mm3/1000 strokes):
1 -4 4300-4500 ohm 30892
2 -3 7200-7400 ohm 30893
3 -2 9800-10100 ohm 30894
4 -1 13100-13500 ohm 30895
5 0 17500-18000 ohm 30896 (If you remove the resister, the PMD acts as a number 5)
6 +1 27700-28300 ohm 30897
7 +2 43700-44700 ohm 30898
8 +3 58400-59600 ohm 30899
9 +4 79800-81400 ohm 308900
