The ole 4.9 is running pretty darn well these days after the new distributor -- but at idle, in gear, it now seems just a little jittery to me, based on past experience. But "past experience" is a little hard to quantify! The idle RPM is correct, and I have no codes. But what's reasonable to expect? I seem to remember it purring calmly at stop lights, imparting no (admittedly subtle) "jitteriness" to the driver through the brake pedal and steering wheel.
Is this something that can be addressed, and if so, what needs to be done? BTW this is a rebuilt engine with less than 10K on it...
Automobile(s): 58 Coupe Deville, 77 Coupe deville, 90 Deville
Re: 4.9 a little jittery at idle
I am having a similar problem with my 4.5 (a few posts above yours) I haven't really got an answer to my question about getting the distributer 180 degrees out. But I can tell you that double checking the timing may help and check those plug wires, they are easy to get mixed up