Fuel injectors can short-circuit electrically causing a rougher than normal idle and reduced performance.Google+
Car Problem Reports
Chevrolet Lumina Fuel injectors can short-circuit
Chevrolet Lumina Problem
Engine Affected: 3.1L V6
Average Mileage: 155,050 mi (110,000 mi - 260,000 mi)
Visitor, 1990 Chevrolet Lumina, 3.1L V6, 140,200 mi
Car had failed to crank, then seemingly the battery had a lose connection, and after hand tightening, cranked right up. Week later, battery drained down, to very low voltage, possibly due to the injector problem starting or stripped battery lug nut not making a good connection. Then right after reconnecting the recharged battery, with new connection nuts, 12 Milli-amps current was seen as the current drain. Next, within an hour, while driving the car after several minutes through the city, at 35 mph, sitting at a couple of intersections, then nearing the 12 minutes destination, the car just died, coasted into a parking lot. The mechanic took a long time to find the problem, replaced the injector with a new one. As for the other injectors, I would like to know if cascade failure will happen, I chose to have only the bad one replaced, the repair place is charging $150.00 for the one.