I bought one and someone has added an aftermarket air cleaner that seems to be causing difficulties (stalling, losing power and backfiring)

I have a 2005 Saturn Ion with less than 50km on it. In  Nov 2009 for some reason the car would not start - it was winter and was late at night.  We tried the next day and it started.  This happened again during the winter but after a boost it started.  We had the battery replaced in Feb 2010 and from time to time, the Saturn does not start and it's not during winter. We brought the car into the dealership and the said it may be a security feature that prevents the car from starting - that is we didn't insert the key in properly. I am no expert but I don't buy it.  After all the years since we had the car, we don't know how to insert the key to start the car?  Also,  the dial on the speedometer goes crazy while driving as it sways back and forth.  What is wrong with the car? How much wwould repairs cost us- best estimate appreciated without seeing the car.  Winter is approaching and i would hate to have an unreliable car.  Should we replace the car? Thanks for your input.

store to purchase a new ling & could not find one< they suggested a clamp on hose. Could I use a 3/8 copper line instead of the steel line? This line is located between the radiator & engine & clamped on the frame.

so I took it to the dealer and they said the open circuit in taill.lamp failure sensor

Car runs fine on freeway, a bit sluggish but fine overall except at rolling idle--surges or stalls.

I have keyless remote and the doors will not lock when I press the lock button on the remote or in the car, but the alarm is activated.

Has anyone worked on the code P0303 and P1310 igniter circuit bank 2(cyl 2 & 3)?

The heat/air cond. work, the defrost works, and the power windows work. Trying to determine if it's burned out bulbs or fuses. I'd like to correct the problem myself if possible.

Thank you.

Car starts up fine but when you put it in drive it went back to park, then it went to nutral,visual inspection has oil leaking from valve cover gasket but dry under pan of transmission. also cost of valve cover gasket/

both have the third light but none of them work. backup, tail lights and every other light works but the 3 brakelights

I've heard about a switcth under the brake pedal, i've checked all the fuses, bulbs. is there a diagram of the brakelight switch. maybe i can remove and replace myself. it strikes me odd that both went out around the same time. any info you can provide will be most appreciated..respectfully Jeffery

I had changed water pump and was test driving when it dies is there anything battery related I could have messed up

I need a right ABS sensor. I was told the job, including labor would be $200+ That seems high.

we need to change it what is involved

alternator was replaced with new one a week ago for high voltage msg on info in dash also battery light comes on and heater fan will cut on and off seams to happen more on take off over 1000 rpm brake light and abs light will also flash on at times you can cut the engine off and restart and lights go off have confirmed that voltage does go up off 17 volts any idea whats wrong