Stumble under full throttle.
#1
Stumble under full throttle.
Curious if any of you have experienced this. Never did before on this car, even with over half a million miles on it. 1974 Cutlass Supreme, 350, freshened up at 492000 miles, now has 520000. After a recent 1300 mile round trip, it started to stumble when the secondaries opened up. I installed a new gas tank, because I figured I had an obstruction in there, and it had the original tank. The sock was loose in the tank, so I also installed a new pickup and new hoses. Was better, but still there. I installed another carburetor, another distributor (HEI) and it still does it. I am thinking I may have a defective fuel pump. The one on there is only a couple of months old, but it may be crap. Lots of bad parts these days.
#4
Last edited by goatwgn; June 26th, 2023 at 11:37 AM.
#6
I'm also experiencing some stumble on hard acceleration (i.e passing on a freeway), but have been told it's old gas. There's less that 2000 miles on the engine rebuild, and the carburetor was recently rebuilt. Before going down any rabbit hole with fuel pumps, what is normal fuel pressure for a mechanical fuel pump and does that number change under acceleration?
#7
I'm also experiencing some stumble on hard acceleration (i.e passing on a freeway), but have been told it's old gas. There's less that 2000 miles on the engine rebuild, and the carburetor was recently rebuilt. Before going down any rabbit hole with fuel pumps, what is normal fuel pressure for a mechanical fuel pump and does that number change under acceleration?
#8
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