Urgent..Just found a 1990 for sale with the 6 cylinder. sign says EGR,O2 etc replaced so sounds like a recent debugging rabbit chase.. Is this as bad a gas hog and power dog as some of the pick ups I've been told about? Search of all forums didn't turn up much. This is real clean and asking $2750 , but I want to know about gas mileage and engine /trans problems. I trust it will do snow and off road good. Would really appreciate this as I have two project Blazers,73&74 I will sell if this works out. Your chance to reclaim me from the Dark SIde. Please tell me about these puppies! Thanks in advance.