Just replaced harmonic balancer test drove it and Engine light came on only at idle but went out when driving but had stuttering problems. Then i shut her down for a few minutes and when i started her back up no engine light no stutter. Now the real problem went to the gas station got diesel left and within 200 meters as i was accelerating it completely shut down motor lights everything. Just bought the truck and it had no problems. Got it to start back up after holding the pedal to the floor and she drove fine after that. Mods: Relocated PMD, Kill switch under dash, Aftermarket deck, exhaust and boost gauge. Where do i start to look for the problem?