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« on: June 19, 2017, 05:21:54 PM »
I need some ideas. My 69 SS350 with original engine, transmission and rear with approx 74k miles on it. While driving, there is a noticeable hesitation every few seconds when accelerating or allowing the engine to deccelerate while in gear - but "at pace" it doesn't seem to do it as much. The issue has been getting worse, and it does feel underpowered. It dramatically lunges at low speed.
My first thoughts may have bee way off base. I was thinking transmission, because I also had an oil leak that was minor until after a 18 month sit in a paint shop. Now the oil pan leak is much worse, so I was also thinking I had developed a rear main seal leak - which might have been letting oil pass to the transmission. Not knowing what the result of this could be, I just put these two things together.
But maybe this is a carb issue? I had it rebuilt, and I reinstalled it myself a few years ago. And the it sat on the car unused while there were other issues. It was off the engine during a freshening of the paint. So could this be a vacuum leak issue? Maybe as simple as a gas filter? I did install a new fuel pump that had been leaking, but then that fuel pump sat for the 18 months.
I have the car at a shop getting new springs front and rear. I asked them to look at this when fixing the oil pan. Too much of a mess underneath to decide if there is a rear main seal leak. The mechanic suggested it may be the carb, says he doesn't like rochesters and suggested replacing it with a holley?!?! or having the carb rebuilt. I don't think I need to have it rebuilt again, but it could have something to do with the removal at the paint shop. Original carb.
Where would ya'll start? Everything is original equipment, except the fuel pump which is a recent replacement. Its an original fuel filter. The only known issue I have is the gas tank was removed and now the seal on top of the gas tank leaks if I fill it past 3/4.
Thanks - Andy