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Okay, I'll give this a shot because so far four different Toyota dealerships have been unable to resolve this issue.

Vehicle: 2008 Toyota Tacoma SR5 4x4, 5-speed manual transmission. 238,000 miles, original engine and transmission. I am a Nazi when it comes to preventative maintenance, so I take care of my vehicles.

Issue: When I hit ~2,500 RPM in 4th gear and engage the clutch, the throttle sticks at 2,500 RPM for approximately five to ten seconds and then very slowly starts to wind down to normal. If I punch the accelerator it unsticks and returns to normal.

Problem: IT ONLY DOES THIS IN 4TH GEAR. If I reach 2,500 RPM in any other gear and engage the clutch it behaves perfectly normally. I can reproduce this at will.

Repairs made so far by various dealerships:
- Disassemble, inspect, and clean throttle assembly - no problems found
- Clutch replacement (An unnecessary repair that I ended up not paying for when I complained - that's a different thread)
- Head gasket replacement (for a different problem, but interestingly enough, it made a difference for about two weeks and then it came back)

At this point I am half tempted to just take it in and tell them to replace the throttle assembly even though they say there's nothing wrong with it. My big question is why does it only do it in 4th gear? How could throttle "know" what gear I'm in?

Good luck, and thanks!