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Message: [QUOTE="jbolen323, post: 1515796, member: 23090"] this is very interesting. I too have issues with LPOP, while running or idling my dash light will drop to zero on oil pressure. As soon as i touch the pedal it spikes back to normal (7psi switch and acts like ZERO hiccups) Ive swapped switches, ive done everything to rule that out. I also used to fight hard rough lopey starts on and off, where my truck would start instantly then actually right afterward go into a rough low oil / aeration idle and then settle out shortly. It was completely sporadic and never consistent, my only thought is was the resi was getting drained since i do not have the riffraff spacer. Ive gone and checked all this stuff as well, have the diagrams everything checks out. I have a brand new motor build that blew out the rear oil galley plugs shortly after abusing it to hell and back, which has me paranoid as hell now when i drive and let off the throttle just to watch my oil pressure gauge bounce up and down, which doesnt seem possible because the truck has ZERO hiccups when it happens, and if it did really drop to 0 psi... how is it running ?! I've also reverted back to a stock lpop vs a melling as a friend did prove to have issues with pressure compared to the two and actually deals with joey, the only way i was able to get ahold of him. All i do know is that i never had these issues on my last motor before i blew the rods apart, its annoying and everyone ive talked to is stumped. Glad to kinda sadly see someone else is having something a little similar. just had my pumps sent out to joey actually almost six months ago, finally got them and they exploded less then five minutes into my truck again, but thats on a different note. Hopefully im not waiting another six months... my truck hates bieng on a used single hpop. [/QUOTE]