I have a 2003 4.2 that loses spark and fuel injectors at startups, one out of every 2-4 times u try to start it. The signalsare gone, then come in dim, then brightly and car starts. Other attempts, the car starts quickly and perfectly. Cam and crank sensors, ECU,
Throttle Body, ECT, EFT, have all been replaced with no change. Have any other Techs run across this problem in other shops or dealerships? 4 hours of diagnostics cost at the local dealership turned up nothing.

Thx