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Q & A: Cars Runs Poorly- Timing or Carbs!

John,
I have a chrome bumber 74 with a rebuilt motor(.20 over) that was running just fine. However, I decided to remove the emissions hardware and upgraded to K&N filters. The car now seems to run real lean at speed. I upped the needle size(from Joe Curto) twice. Car runs better now, but still will miss at 55-60 mph, feels like it won't run through a paper bag. If I pull out the choke at those speeds the missing dissapears and the throttle is very responsive.
I have tried to go through all the electrical and fuel related items to find leaks or other problems, but have not found a solution. I have re-tuned the carbs(spark plugs look great), replaced the vacumm assist and line, changed out distributors, converted out of points, messed with the timing, new coil, fuel pump checks out and new fuel filter.
The car itself only has 33K miles, so I have ruled out the carbs being warn out. Plus like I said, it ran fine before I removed the air pump and associated equipment.
Any ideas?

Thanks. Bill-

Bill!

There are four systems: emissions; engine; ignition; fuel. If the car feels like it running into a headwind, like you're pulling a trailer; if it coughs and/or spits under light load, then either the timing is retarded or t... read more