My 2.2 D4-D 2005 Toyota Avensis sometimes, when starionary at a red light (apparently this mostly happens at red lights), revs the engine up and down, basically sometimes the needle goes from 900 rpm to 1100 rpm up and down continously, and if I rev it up to 2000 a couple of times everything comes back to normal. This happens rarely.

Also, sometimes, it won't go into reverse (no sound, just the stick won't budge), again sometimes, but most of the time it does. All I have to do is press the clutch a couple of times, everything comes back to normal.

Went to first mechanic, told me the reverse thing is nothing to worry about, it's normal, something about reverse being different from other gears, it ocasionally backfires. Anyhow, he said that the engine sounds funny, and that it vibrates too much, and gave me a huge quote for changing the clutch and flywheel.

Second mechanis said the gearbox seams fine, says he can't tell if the engine sounds wrong since I'm the one driving it I should say if it sounds unusual, but it vibrates a lot, and maybe should consider changing the flywheel and clutch. Said I can drive on for the time being, problem is not very bad.

What do you guys think I should do, is there a way to tell without opening the thing up? The going rate for changing the clutch around here is about 100 pounds+ the price of the parts. So basically It would cost me 100 quid to open it up... see what's in there...