Timing with headers and no cat

[bake182]

Hello,

New to forums so bear with me . I recently installed a 1995 5.7l TBI engine in a 1972 Blazer. Used headers no converters stock mufflers . Have major low end power problems. Set timing to 0 degrees. Ran terrible needed to advance timing at 15 degrees. Runs real strong but still have idle load up problems cold. Used 1989 wiring harness since I used a 350TH tranny. Still need to hook up VSS sensor. Any suggestions on timing.

Thanks.

[2000CAYukon]

Did you disconnect the EST wire (black with tan strip) when you set the timing? I have checked the timing after reconnecting the EST wire and it was at 20.

//2000CAYukon

[bake182]

yes I did disconnect the wire set timing to zero and ran terrible. I set timing until it ran and started the best then put light on it again.

Thanks

[67malibu]

Have you played with the TPS voltage? 'Loading up' especially when cold could be something else.

[bake182]

No I have not. I suppose I could have many sensors that are "bad" but the sensors should not have an effect on timing could they?