It was 90 degrees outside today, still does it, aslong as the engine temp is cold it will occur. Basicly if the engine has not been started or has sat for 4 or 5 hours. Now the colder the morning the longer it will Blue smoke and bog down. The dealer has checked timing and run diag. on it, they are not finding anything abnormal for some reason. We just recently cleaned and checked the IAT and Map. Only issue we could find is that the Map sensor was reading above a .8 base signal. The spec is .42 to .59 and said to replace if not within these peramators. We also check the supply voltage and ground just to make sure. We went ahead and replaced the Map based on the information we had and found that the problem still occurs. However this time when we check for codes we had a PO216 for pump timing. We went ahead a check it again and have not found any issues with the timing. The flow chart for the code says If there are no other code showing to check for pump timing, lift pump pressure, and if these all check out to replace the vp44. however if can't quite believe its the pump because once it does warm up it will run great no problems pulling or cruising. This has been on going for over 3 years and has now gotten anyworse or better.