[Timbodiesel]

Hey everyone..first dodge 2003 1500 st with 3.7 v6..100k miles..only had truck for 3 months..drive 75 miles a day..ok so when i start up it pushes white smoke for about 30seconds to 2 minutes..losing a small amount of coolant(1/2 gallon in 3 months) temps are good on gauge steady less than half..but just got a p0304 code..misfire #4..is this a bad sign for you guys? Plus no apparent leaks ..oil is clean and not making oil..but oil fill cap did have a slight whitish with brown gunk on it..no history other than bew water pump at 90k miles..appreciate any input from the experts

 

[Squiddaroo]

Your description sounds like a potential head gasket. If water pump failed then engine likely overheated. Overheating often results in head warping and gasket failure.
Check the plug on cylinder 4 for coolant.