When I got the truck the timing was way off. I set it correctly.this eng was a transplant from ? It is an 87 454 TBI. It has an inline blue holley fuel pump, Hooker headers,3" exhaust all the way back with flomasters. 1 o2 sensor in the driver side, I think the map sensor is working. I changed the plugs and it runs better but does load up one in a while at lower speeds. It has plenty of power. I did not build the truck but trying to get it to be smooth. plugs are gapped at 40,they are Autolights. Thanks for the advise.

Leorilla.
66elky@gmail.com