I have a 1992 olsmobile 88 3800 v6 it only turns on after sitting for a couple hours. when the car is on it smells like gasoline. while driving the idle is constatly moving up and down. can it be the fuel pressure regulator?

If the exhaust coming from your vehicle smells like gasoline, it's often due to an overly rich air/fuel ratio. This means that either too much fuel or too little air is getting into your vehicle's combustion chambers. This can be caused by problems like damaged and leaking fuel injectors, a clogged air filter, a bad mass airflow sensor, or a number of other problems. In addition to a gasoline smell, you might also notice black smoke coming from the tailpipe.have you remove cat converters

On a 2006 PT Cruiser, there is no direct means for gasoline to enter the crank case, so there should be no liquid gasoline there. Now, you will get a typical crankcase vapor smell (for lack of a better description), especially with higher mileage engines. These are hydrocarbons that have a distinctive smell.
Now; if you suspect gasoline in your crankcase, then take a quart sample of your oil and allow it to sit, sealed and undisturbed for several hours or all night. If there is gasoline, or water, then it will segregate accordingly.
Things to check:
When was the oil last changed?
When was the PCV (Positive Crankcase Ventilation) Valve last changed? If this is clogged, the result will be a strong hydrocarbon smell that will increase in intensity since it cannot vent properly. I would lean more in this direction.

Is there a smell of gasoline? Wrong spark plugs or spark plugs failure.

cound be the crank sensor going bad.

Not likely heat related

I would guess your fuel pump is worn out
& occasionally stops from mechanical or
electrical issues

You could check the pressure with a gauge
attached to fuel rail but on a 1992,I'm guessing,
again, that it is the original or second pump

You may just have to replace it to solve the problem

bad fuel pressure regulator most likely

If it is running fine, the busted bolt isn't the source of the gasoline smell. The intake manifold has vacuum, so the smell wouldn't be getting out, air would be going in, and a vacuum leak would give you poor idling. The exhaust manifold wouldn't have much raw gasoline smell. But it would have loud noise if the broken bolt were causing an exhaust leak.

Check that the vapor recovery line is not broken or disconnected. The hose connectors get cracked. If that were broken, it would cause a gasoline smell after the car has been sitting, especially if it has been sitting in the sun, heat driving gasoline vapor out of the tank. It is supposed to condense in the vapor canister, but some escapes if the line is broken. If it is broken, driving would **** out the gasoline from the line and the wind would dissipate the smell.

Or it could be a leaking injector. With the injector cover off, engine idling and cool, you can visually look for raw gas around the injectors and injector rail connections.

Hope this helps.

you have a bad fuel injector. lift the rail with injectors on and carfully turn ignition on. you should see one or more of them pumping too much fuel.

Did you fix this yet?
Are you getting fuel to the plugs?
Try starting the car, then remove one of the plugs. Check for the smell of fresh gasoline. You could also try smelling the exhaust to see if there is a fresh unburt gasoline smell.
If your getting fuel, then the fuel system is probably not the problem.
Are you getting spark to the plugs?
After you replaced the Distributor, did you adjust the timing?

check under dash neer pedals make sure that theres not a wire shorting up under there