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Shaft bushings will not cause that kind of problem by themselves. They can be compensated for by adjusting the idle speed up and enrichening the mixture screws a bit. Keep looking for a vacuum leak, Especially around the egr valve area. Keep in mind if the motor has some miles on it, you can advance the timing a bit more than stock. Also check with a timing light and see if the timing is wandering, could be loose timing chain and/or advance unit in the distributor.
Shaft bushings will not cause that kind of problem by themselves. They can be compensated for by adjusting the idle speed up and enrichening the mixture screws a bit. Keep looking for a vacuum leak, Especially around the egr valve area. Keep in mind if the motor has some miles on it, you can advance the timing a bit more than stock.
Also check with a timing light and see if the timing is wandering, could be loose timing chain and/or advance unit in the distributor.
