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East Setauket, NY
It's like any other bolt. Loosen by turning counterclockwise. You're gonna need some torque if it's been jammed on there.
Is the check engine light on? Any (pending) codes? Your noise can be coming from any one of the components that are driven by the engine (i.e. water pump), perhaps even the tensioner or idler bearing (driven by timing belt) - a closer inspection is needed! Any service history you can provide would be helpful.
a throttle what?
There could be a short somewhere. If they were recently replaced, can you confirm you have the correct bulbs installed?
Not much can be done. You can try testing the downstream O2 sensor but after that, the only culprit is the catalytic converter.
It's most probably the Idle Air Control valve. You can try cleaning it, there are several methods from light cleaning (by spraying throttle plate cleaner into the IAC port from the throttle body) to in depth cleaning by taking the IAC off of the throttle body.
Can you start with what the problem is?
Try (lightly) banging on the starter with a screwdriver or something, if it makes any difference, you've found your problem. If not, I'd investigate further into the ignition switch. Good luck
What are the codes?
There is a short somewhere. It could very well be a faulty resistor causing the short (it's located behind the glove box - no need to remove glove box for this). It's around $22 from the dealership. You can try removing it (2 phillips screws) and see if it's corroded. Good luck.