Hmm, the H3 governor kicks in around 110 MPH, and we do have some 10 - 14% grades around in Phoenix. My H3 Alpha and Champ don’t have an issue with them, loaded or empty, and I have to keep a close eye to ensure I’m not attracting the attention of the authorities in a negative fashion with them. An Inline 5 or 6 is sluggish compared to the V8, but a Trailblazer SS or a lightweight Telsa can suck the V8‘s doors off. But I can tow 3 of them with the same MPH on the test track Interstates where the speed limit is 80 In south NM and AZ.
When I got the my “newest” ‘08 Alpha, the gas mileage and acceleration sucked and temps were somewhat high. I put in a new fan clutch, a quart of Risolone in the oil, and four fuel treatments, and now both the ’09 Championship and the ‘08 Alpha are right in line with each other Performance-wise. The ‘08 had mostly sat for apparently the last ten years, really since new. II had to do a front end on suspension on her as well but now she’s purring. Bump stocks are shot on the Champ, so she goes in next week for those to be replaced. I’ll let someone else break their knuckles on that.
Try to see if your latest find is throwing any codes or showing an emissions hold up. Most auto parts stores will happily run a check for you if you don’t have your own reader.
