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check for vaccuum leaks.. try spraying brake cleaner around the lines and see if it changes anything with the idle spped.. if it sucks in some it will chug while you spray it.. That helps locate a leak..
check for vacuum leaks. You can do this with a can of carb spray but please be careful as it is flammable! if the ignition wires are leaking and you hit them with carb spray you will start the engine on fire!
The safer alternative is to have the engine "smoked" for vacuum leaks. This is done with a smoker. Any place that is leaking you will see smoke.
A trained ear will also be able to hear a leak.
If no leaks are found try unplugging the MAF sensor. Is is in the air tube next to the air filter box. If performance improves try cleaning it with some MAF sensor cleaner. If that doesn't work than you may need to replace it.
sounds like the a/c is low of freon if the compressor is cycling that often due to low pressure. the idling problem sounds like a bad idle control valve. is the check engine light on? if it is and a p0171 code(system too lean) is present you should check for vacuum leaks.
Idle speed is probably set too low. The computer should adjust this speed, so have engine codes run to ferret out any problems with sensors, etc. But first do this test: Crank car, let it idle. Raise hood, and move the big tube that goes to the throttle body a little. If the engine dies, you might have a tube that has developed a leak. Check all hoses for vaccuum leaks.
As for the lighter and overhead light, these are often wired to the same fuse. Check your fuses, Then check the wiring. Good luck with that!! Wiring problems can be a real dog to solve. With any luck, it's just a fuse.
You didn't call off the code they found but O2 sensers effect a lot of driving but not the idle. High or low fuel pressure a vacume leak an air bypass motor stuck shut or bad. are more likly . The auto zone guys are great but their not mechanics. Their story is change parts till you fix it and they want to sell as many parts that you'll buy
CHECK AIR FILTER FOR RESTRICTION. A BAD SUPPLY PUMP. OUT OF FUEL. BLOCKED FUEL RETURN LINE. AIR LEAK IN SUCTION LINE. RESTRICTED FUEL FILTER. INOPERATIVE FAST IDLE. LOW IDLE SPEED AND DEFECTIVE INJECTION PUMP.THIS IS A LIST OF THINGS TO CHECK.
your car needs a 'complete tuneup'. clean the EGR port, remove the throttle body and clean - don't just spray, its not enough, remove all vacuum hoses and clean and brush all ports that are connected to the plenum, remove anyports that are connected to the plenum and clean them also, remove the plenum and brush and clean the ******. if you have time, take out the intake manifold and clean also....and that should do it.
It sounds like an intake air ( vacuum ) leak, or ignition timing. Was it doing this before you changed all the above? Or did it start after?
Check all the intake mounting bolts, and carb bolts for tightness. Use a lenght of fuel hose against your earto listen for leaks while the engine is running. A hissing sound will be heard if it's leaking. Wiggle all the hoses with the engine running. You might get lucky and make one hiss at you. A soapy water solution will also detect leaks. ( use hot).
It also could be a leaking egr, or plugged pcv valve, or air filter clogged, or leaking head gasket, bad timing chain, or your camshaft lobes could be worn.
You'll just have to keep looking, and stay calm. It'll feel good when you find it!