4.2 258 makes 'fluttering' noise as I let off throttle??
I have a 4.2 258 on an 88 YJ. It's stock with most emissions taken off. I've nuttered it and removed the EGR valve then capped it. It has a Weber 32/36 DGEV. I've played with the timing by ear (have no timing light yet) and adjusted the carburetor quite a few times. As I'm letting off the gas it makes a noise, almost like lifters but not really sure what is going on. I'm sure I don't have the timing right but did change the distributor vacuum to a ported line - it was on manifold vacuum. I'm thinking of changing to a Carter 4057 fuel pump thinking fuel pressure is problem for the Weber. Any ideas or help would be appreciated.