i have a 2000 model winnebago m/h,454 gas engine. when cold it fires up beautiful,when warm or normal temp it acts as if its flooded. i have a new engine from gm (they installed it). the old engine was doing the same thing. 454 with sfi all the electronics. the old motor had 72,000,the new one has only 1,000. no codes and engine runs perfect other than warm start,also has a new gm fuel pump. i hope this the right forum. thanks.