One day I went to start up my '62 Valiant resto-rod with a non-Magnum 360, and it had a huge miss. Wouldn't idle. It will run if you hold the RPMs up, but still seems to have a miss.
I've squirted carb cleaner into the idle jets and carb throat, with no improvement.
Sure would appreciate it if you guys would suggest some other things to check.
Thanks very much.
What led up to that "one day"? Just fill up with fuel? Sat for a couple years, maybe moved it around once or twice? Also, to avoid a lot of guessing, it is best to list Your
equipment as completely as possible up front,....OK now I know You have an OE dizzy type, orange box, chrome box, what coil, ballast,MSD.....carb type, etc...........?
1) Fuel quality....check it.
2) Fuel pressure...check it.
3) Timing light on it..........dropping out or steady flash?
4) Timing mark......where You left it?......Jumping all over?
5) Vacuum gauge.........for Gods sake get a long enuff hose and sit there in the seat and keep it running......what does it read and what is it doing?
6) Battery............voltage B4 & after starting.....12.7.......then steady & around 13.5-14.5?
7) Voltage at the ballast resistor wire from ign. within 1 volt of the Batt.? Or at the MSD if using that?
8) History of this engine..........built recently?.....mild/wild?..............adjustable valvetrain/stock?