I have a problem setting my timing. I have an 88 305 TPI. The problem started when I replaced the distributor (stock original) with an MSD probillet for late models. This distributor has the same style module connections as my old distributor (8 pins) but The problem is as follows.

when I set the timing to 6DBTDC it idles ok but then when I rev the motor the timing does not advance much and stumbles as a result.

so far I have tried replacing the Distributor module the ESC (knock) module, the knock sensor and the computer. I have checked to see that the balancer ring has not slipped and when I set the timing I have unpluged the EST wire.

I am truly at a loss for what to do next after throwing so many parts at this problem.

Any Ideas as to why my timing is so F**ked up are perfectally welcome.

Thanks