99 Mercury Mountaineer will not start on 1st or 2nd attempt.

The orifice tube is located at the firewall, INSIDE the refrigerant line, where the end of the flex line connects to the metal pipe which, in turn, connects to the evaporator coil inside the air exchanger.

It depends on how many miles you drive annually, the environment your vehicle is driven in (dusty, hot, cold, humid, dry, etc), the type of oil you use (conventional, synthetic blend, or full synthetic), and the condition of your car's engine. You should consult your owner's manual and the data on your engine oil.

I drive a 1999 Mercury Mountaineer 5,0L and drive it about 1,500 miles annually. I use a synthetic blend oil and change my oil and oil filter twice a year. I change the oil in the spring so I have fresh oil for the hot summer driving season and I change my truck's oil in the fall after the hot summer driving season. Because my Mountaineer has a lot of miles on it, I use thinner oil in the winter 5/20 and thicker oil in the summer 10/20. I check my oil regularly and look at the color and feel the oil for grit. This has worked for me for many years and I have had good performance from my vehicles.

You can go on the different oil manufacture's websites and read their recommendations as well. There has been much debate about when to change the oil in a vehicle so you have to decide for yourself what schedule you want to follow.

013 Idle Speed Problems PCM Test

007 Idle Speed Problems Scan Data for Idle

test don't guess .

The flushing could make it worse

I never flush a trans,could put sediment
into solenoids

Have a trans shop diagnose & replace the
clogged or failed solenoids inside the pan

yep! any good shop should have an battery, alternator, starter tester, thay hook it up to the batery and do a series of test's

sound like Neutral switch warning.

Check if your reverse light works.
If not replace it and you will probably be changing your neutral switch. unless you change it before it goes.

Incidentally when it goes the car will not be able to be put in gear once started.
It will be able to drive only if it is started in Neutral.
Good luck.

AAMCO is going to love you
coast to coast warenty and free estaments

failing that ( ie cant aford work ) time to hit the salvage yard as they will likely beat aamco with price and use a similar trany from a wreck

if it won't crank at all then battery is first thought but before you drop $100 on a new one, see if you can get it started with a jump start

NO replacing the pump wont change the timing at all.