70NewY’ER
Member
Hello everyone. I own a 1970 Chrysler New Yorker with a 440 i had rebuilt in the summer of last year. I put a new Holley 4160 Street Warrior carb on it back in November. All was fine up until recently. 2 weeks when i was on the highway I stomped on the gas pedal (fully depressed) at around 50 mph and let off at around 90 mph. The engine started to bog and rev down with the pedal pinned so I let off. I tried again at around the same starting speed of 50 mph. The car didn't bog. Fast forward to last week, the engine ran a lot worse under a load. When the car hit 45-50 mph on the road the car would buck and jerk and bog. It got so bad to the point where the engine stalled. I would let the car sit and idle for a bit and it would operate fine untill it hit a steady 45-50 mph and it would act up again. I tried adjusting the float in both bowls so the fuel was just trickling out of the port hole. No change. Changed the fuel filter and nothing. It seems to be getting good flow to the filter so I dont think the pump is bad. I could replace it anyway to be safe. I checked for vacuum leaks and couldn't find any that would cause an issue like this (or so I believe). I might change the spark plugs as well. By the way I am running the newer Mopar electronic ignition system. My timing is set at 2 degrees BTDC with the vacuum advance plugged. I'm kind of at a loss and I don't want to spend any more money than i need to. Any help woulld be appreciated!