I have idling that won't learn. I had the throttlebody replaced valve lashing done for the 184k. After like 2k miles it starting acting up. Later had it timed from it jumping a tooth and the tensioner was leaking, had a new belt put on spark plugs just because of how many miles since last done coils are fine and intake boot was cracking but replaced. On the back side I had 2 vacuum lines replaced that where starting to Crack. No build up in the vavle cover and its been maintained very well. I can't find a reason for the issue.. before I had any issue and the 2k miles I drove home from out of state.. so let go in order of event. Went out of state had the valve lashing done. Got home had issues a few days later then took it in. I then did my spark plugs and for the misfire issue. Did not fix it then did a coil on plug swap it did not move around on the misfire. Then saw the the fuel was leaning out a bit replaced the fuel filter that was gone but it only effect high rpm but you would not have noticed it starving just off the date tables from the scanner. Fixed the vacuum line and boot to intake. After that tested for more leakes. Non showed up took it in. Redid the timming vavle lashing and timing belt with a new tensioner. Fixed all but the high idle and surging. So now it's bounces when you touch the gad or let off any input at all from. 1300 rpm to 2200 is and levels out. But keeps doing it if you set crusinse it does not work well because it fits its because trys to spike the rpm. If you are at a light it feels like it wants to pull on you a but and let's off . The shop just keeps guessing at the dealer ship and I'm over 3k in at the shop alone the rest of what I did was just to keep the parts new for good spark air and fuel