2000 3500 cab and chassis
First off thanks before hand, and I've searched from top to bottom for this same issue with no luck. The problem is that when I first crank the truck, I have perfect throttle response for about 30secs to a minute, then all of a sudden, almost nothing. The truck will throttle up, but its really slow almost like its in a limp mode. If I turn the ignition off and back on it will work perfect again for about 30 seconds and then I lose throttle again. Problem is sometimes when the truck cranks up(could be the first time, or after I've restarted it with limp pedal), the throttle response will not go away, and I can drive the truck around with no issues at all. Little info on the truck and what its doing. When I got the 2000 dodge 3500 nv4500 cab and chassis, it had a P-Pump converted 5.9 fully built for pulling. I bought the truck not the engine, so I pulled the engine and replaced with a stock 5.9 out of a wrecked 2000 3500 that was running fine even after the wreck. Has a new vp44, new map sensor, and new apps that I recalibrated. All this was replaced before I started this engine in this truck the first time. Fass 250 titanium with new filters with right under 20lbs of fuel pressure(its a 100 psi glowshift gauge so right under 20 is best i can say). I know both battery grounds are good from the battery to the block and on the list of grounds I've seen, all of them are connected. (I'm surprised that there is not a ground from block to the frame, but I may add one.) The truck has thrown no codes and has no check engine or other error lights on whatsoever. Any suggestions?