Hi everyone!
I picked up my first 40 a few months ago, a 1964 with a three on the floor transmission and a 1969 engine which the PO put in. I am very happy with it so far and am enjoying the project; however, I have encountered an issue that I cannot seem to solve. The truck idles beautifully and does fine under slow acceleration or when I step on it after it's already driving, but when I step on it from a stop, it stutters and wants to die and sometimes backfires through the carb. When I pump the accelerator hard a few times and then hold it, it does not seem to do this though. The carb is a Rochester 2G and the dizzy is a Delco Remy 1112403 9K1. I have rebuilt the carb, replacing the accelerator pump (which is what we thought the issue would be), tried different float settings and different jet sizes (came with 49s, tried up through 57s). I replaced all the guts on the dizzy and have tried the point gap at .018 and .019. I've tried different timing as well ranging from 7 to 14 BTDC. To a certain extent, all of this helped, but the problem still persists. Any suggestions?
I picked up my first 40 a few months ago, a 1964 with a three on the floor transmission and a 1969 engine which the PO put in. I am very happy with it so far and am enjoying the project; however, I have encountered an issue that I cannot seem to solve. The truck idles beautifully and does fine under slow acceleration or when I step on it after it's already driving, but when I step on it from a stop, it stutters and wants to die and sometimes backfires through the carb. When I pump the accelerator hard a few times and then hold it, it does not seem to do this though. The carb is a Rochester 2G and the dizzy is a Delco Remy 1112403 9K1. I have rebuilt the carb, replacing the accelerator pump (which is what we thought the issue would be), tried different float settings and different jet sizes (came with 49s, tried up through 57s). I replaced all the guts on the dizzy and have tried the point gap at .018 and .019. I've tried different timing as well ranging from 7 to 14 BTDC. To a certain extent, all of this helped, but the problem still persists. Any suggestions?