Yes. A cracked or disconnected vacuum hose allowing un-metered air to enter the system can cause a lean condition.
I think I'd start looking for vaccum leaks. New cars are much more reliant on strong vaccum than old clunkers. When you punch the brake pedal, the vaccum powered brake booster can steal needed vaccum from other systems in the car (i.e. fuel delivery or vaccum advance type ignition). In some old caddilacs a small vaccum leak can cause the flapper valves in the climate control system to go all nutty. With the engine running, spray a mist of lps1 on suspect vaccum lines. Where there is a vaccum leak the liquid will dry rapidly off of the hose. Alternately you can flex some hoses around and listen for sucking sounds when you move them. Replace all leaky or cracked hoses.
it shouldn't matter if the hose is soft. as long as the hose allows coolant to flow freely, your fine. but, if your car is overheating, u might want to change the thermostat.
Yes, it is the small senor about the size of a car alarm remote with a four pin connector and a single vaccum hose connected to it. It is located on the firewall just to the right of the intake.
Check for a vaccum leak at the base of the carb gasket. Also check all major vaccum leak sources.... EGR valve, power brake vaccum hose, pcv valve sticking open. etc. If the car attempts to leap forward when it dies (like when you pop the clutch on a standard) you have a bad "Torque converter lockup module". Its on the transmission. You don't have to replace it - just unplug it. The car will work fine without it.
If a car dealership has a lean on your car and you have not made the required payments they may repossess your car.
possible hole in hose
I owned a 97 sebring with the 2.5L v6 and it didnt have a mass air flow sensor. There is a lot of vaccum system on that motor so check your vaccum hoses for any leaks. Maybe your pcv valve has gone bad and is running oil into your vaccum system? one pinhole vaccum leak on that car can cause it to run rough or stall out.
If you car stalls when you remove your foot from the accelerator, when you brake for a stop, you will find that you have a vaccum leak, in one of the hoses from around the engine. A vaccum leak causes an engine to run rough, stall and give poor acceleration. Any hose that you can see with cracking needs to be replaced.
yes and you could DIE!
Vaccum leaks
yes it will make bring unmetered oxygen in and the o2 sensors will pick it up and it will run lean (lean=hot) (rich=cool)
It is not possible to seal a hole in a car low side or suction line hose. The pressure of the refrigerant passing that hose will eventually push out the seal. The oil contained in the refrigerant plus the heat will cause the seal to loosen from the hose. It is better for you to have one machined pressed for it will give you a confortable ride and cooling inside the car.