3 weeks ago with no warning, would crank, but not start. Dealer said it was block mounted fuel pump, and replaced it with aftermarket since Moapr no longer makes. 2 weeks later, will not start until about 5th try. Ok for another week, and again will not start until 10 or more attempts. Been in shop for three days and cannot duplicate. Their only answer is to 'guess' and start replacing more expensive parts. I suspect something other than fuel pump from day one, and misdiagnosed. 1999 with 180k. All recommended service since new and never any abuse or heavy hauling. Any ideas??