so i got this 66 chevy truck for a parts runner and driver for a good price im the second owner of the truck so its stock...way stock it runs good for about 15min of drive time then it starts to chug backfire and fall on its face untell it dies it will restart after a second and run fine if anyone has any info on how to fix this problem i would love to here from you

thanks

jeff

 

I would check to make sure you are getting proper fuel pressure and that the fuel line isn't running too close to the exhaust manifold and possibly vapor locking. Are you still running a mechanical fuel pump?