24 degree's timing??

[Saltmaker]

My car has been running good since I put it together, but it has a bucking at 2000 rpm! Very anoying! Well I set my timing at 12 degree's when I put it together and it ran good, but it was doing the bucking thing bad. Well I tried to rotate the rotor counter clockwise one tooth and reset the timing. When I first started the motor (timing not set yet) it started and idled the best it has ever? When I checked the timing it was at 26 degree's with the spout out? I lowered it to 22 and ran the car. WOW it ran the best it ever has with no ping???? Well I got nervous and lowered it to 18 with the spout out and drove the car again. It bucked terrible and felt slower. Then I set it at 24 and again it ran better then ever? I don't hear any pinging and the car runs better then it ever has? I can't make sense of this. Has anyone seen anything like this before???? I'm stumped. The thing that worries me is that I don't hear any pinging, but I do have long tube headers and off road exhaust with 2 chamber flows, and I think the car might be to load to hear the pinging??



------------------
1994 Mustang D.S.S. pro bullet 306, TFS heads, cobra Intake, 24lb inj, E-303 cam, 70mm throttle body, 75mm maf, 93 computer conversion, 3:73 rear, Kenny Brown subframe connectors, Eibach drag springs, Megabite jr's, Long tube headers, off road exhaust, 2 chamber flow masters...