Re: 78 Suburban surging then dies on long grade
Full time 4x4 that is pretty good. I had a blazer that was stock 400sb, t350, np203 and 3.07s. 8mpg in town and 6mpg interstate. I swapped ina 4spd and np205 along with rebuilding the 400 and got up to 14mpg interstate.
It sounds like your PVC is clogged up or sticking. I would just throw another one on and go from there. Do some research and you can get different PVC valves that open earlier etc. No sense spending $100 on the adjustable deal in my opinion when $20 will buy 3 or 4 PVC valves.
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