My 97 TJ 4.0L makes a sputtering sound when climbing a hill at 35-65 MPH. It sounds like exhaust, but the emissions inspection guy said if there was a leak, it wouldn't have passed. Sounds like it is coming from driver side front and "echoing off the pavement." I can't reproduce the sound sitting still and revving. Any ideas?
I've been thinking about a new exhaust to give it a little "throat." Any suggestions for good sounding and efficient exhaust systems. Keep in mind I live in a suburban county which requires annual emissions inspections.