driving yesterday in 110 degrees a/c on max. my chevy 1997 2500 pickup 4x4 with a 7.4 was hesitaing,then when i tured it of and went to start it up again it started but stayed sputtering. i let it set for about two hours then it started but still hesitated.there was a funny smell not gas,the feul tank had a lot of pressure build-up, ive been using a ethonal blend gas last couple of fuel fill ups. drove it last nght when it got cool truck ran fine. is my truck vapor locking,the feul pump going out, bad feul or some sensor what do you know?
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