Just back from a 5 day camp event and 4x4 poker run. Odd experience: when driving through a really long, relatively rough trail section-- nothing special just an endless road of water mellon size rocks, and at faster than a crawl felt like rig was running over heavy washboard. the suspension usually absorbs these sort of terrain features. Go to neutral and coast, the bump bump stops. Come to stop and rev RPMS and at idle or up to 1500 RPMs engine running VERY rough. Sounds like a boat exhaust. bubbub bubbub, sputtering and running really rough. Cycle RPMs up higher, back to idle and repeat couple times and then all is well and she runs like it should.
the symptom reminds me of the carb days when it would load up off camber. First Q is any comments or suggestions? Can EFI get confused from relentless pounding?
Fuel pressure was perfect. no pressure in tank-- opened cap. full tank of gas.
then to add to stress, all of a sudden when starting twist key forward and the screech of starter stays on, manually dial back key to stop it. its either a spring on starter spur or in the key lock assembly (which i completely rebuilt with new parts last winter)
SMH, its always something... but this random rough running engine is a concern.