I have an '88 K5 with the 5.7 with fuel injection. Yesterday it wouldn't start, I checked to see if it was getting fire to the plugs, it got only 1 spark when I turned the key to start. I replaced the: plugs, wire, cap, rotor, control module, pick-up coil, and ignition coil. Still no spark!! Any ideas what to check next. The coil is putting out a good spark when I pull the wire from the coil to the cap.