4.0 ZJ Weird RPM drop
This has been an ongoing problem for a few months now and I think it is a vacuum leak but have read that it could be a torque converter issue. When the engine is at normal operating temp. and I am driving through the neighborhood at 25 mph, barely on the gas, the RPM's drop about 500 and go back up to normal every 2 seconds. Also when I am accelerating the same thing happens, the RPMs drop about 500 and go back up until I completely let off the gas. I feel like it is a vacuum leak but I have checked them all and they are secure and not cracking or anything. Thank you in advance.