Well, I've finally decided to post my issue. I hope it's in the right place on the Forum. I have a 2003 VW New Beetle 2.0 GL, 102,000 miles. (AEG on timing belt cover, but BDC per VIN number-just found that out today-lovely). Anyhoo, I have done a LOT of work on this car since I bought it in May. I'm going to list things I have done myself already. I have installed a new radiator, expansion tank, cooling fans, thermostat, radiator hoses, air filter, secondary air intake hose, hose from FPR to manifold, a couple of other cracked hoses, battery, alternator, alternator harness, fuse box, canister purge valve, shocks, brakes, rotors... SO, I finally drove myself berserk trying to figure out what was causing this bumbly, rough sporadic idle at low RPM (stop lights, parked, etc). I have no issues with hesitation, stalling, acceleration. It also has a mild gas odor from time to time. I finally took it to a MECHANIC. Very reputable and trained/certified (whatever) on German cars. My car is not throwing any codes. I let them replace the spark plugs and wires, but the rough idle persisted. They then had it for three days trying to diagnose this rough idle. They consulted with others. They did a smoke test (all good), along with inspecting hoses, other parts, etc. No answers. Everyone is baffled. They can feel it when seated in my driver's seat, but have no idea what is causing it. It is making me nuts. I have rolled around various fuel system issues. I have plans to get timing belt and water pump replaced, but before putting another dime into a mechanic (I dare not mess with timing belt), I want to figure out my idling issue. And I really don't want it to be my fuel injectors LOL...getting the manifold cover off is a PIA! Any help, suggestions, education is appreciated. I am not a mechanic. I'm just trying to avoid a pricey mechanic (my GOSH, EXPENSIVE), but I was desperate for an answer. Thank you in advance.