rpm up and down

[rammintl]

Hello,
I have a 2000 celica gts turbo charge and having a problem on the rpm. When you turn on the A/C the rpm goes down first and then up and down. It does not shut off the engine. All it does is the rpm goes up and down. I am going to have my maf sensor cleaned today and see what happens. Anybody had that experience and please let me know how I can have it fix. Thank you

[khooper]

You didn't say whether it was auto or manual. With manual, the RPMs should rate high when the car is first cranked. Judging from your description, it sounds like the engine does crank. If so, if it runs rough, then I would agree that the new plugs may be gapped incorrectly. If the engine starts, and you rev it some and it runs fairly smooth, then I would suspect it is a fuel supply problem. Even though you replaced the filter, it may be something else... automatic choke may not be functioning properly (especially in light of the cold weather). Also, with 160k miles, the fuel jet(s) could also be dirty. With knowing exact details, it boils down to the old principle of trouble-shooting...Getting spark? Getting gas? The old process of elimination...Good luck
and oh, don't be too proud to accept your limitations... If it's beyond you ability, take it to the professional..messing around and replacing parts can make the problem worse.

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[drewd]

It's normal.

[nunley]

My Celica does the same thing. So did my last 3 cars and every A/C equipped car i've ridden in.

If this is the only problem with a turbocharged celica, You are in GREAT shape congrats!