i had the same problem with a turb impulse i had. I changed the wires, plugs, fuel filter, and caps. The problem was timing and gap of plugs. Timin was a lil off and after a couple times of regapping i got it back full force boost with no bogging. jus a thought

oh yea if it runs best cold, i think its cause ur timin advances to warm up the engine. That could mean ur timing is retarded too much.