2000 Mercury Mountaineer with 4.0L,going down hi way quit running, tries to start but o only runs for 2 seconds,then dies again,replaced can sensor didn't do any good! Please help

automatic choke problem, or coolant temperature sensor.

https://www.google.com/search?safe=off&rlz=1C1QJDB_enCA643CA644&sxsrf=ALeKk01tSVuD2BCVhM1Vpy9UWruXaYkc_A%3A1610058866809&ei=coz3X6HUMMey5NoP7daMwAo&q=97+Mountaineer+run+fine%2C+will+not+start+hot

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check fuel filter and fuel pump for proper operation.

check fuel filter and fuel pump for proper operation

check fuel pump and filter for proper operation

you can try replacing the a/c cycling switch. but if pressure is going up and down it sounds as if there's a leak .did you try stop leak when you tried recharging it?

I think you should go for manual first after that it will be easy for u to solve your problem. I had visited this site past 2 months before for my vehicle and find it quite helpful may be you will also get something useful here
Mercury Mountaineer 2002 2005 Factory Service SHop repair manual Download

Air Filter-clean or replace
Clean MAF Sensor--CRC MAF Cleaner
Clean throttle plate-CRC Throttle Body Cleaner
Spark Plugs- replace every 70,000 miles
Check -for vacuum leaks on ALL ducting and hoses
Replace front 2- O2 Sensors-ones closest to motor ,every 100,000 miles

Have TPS Sensor --tested with an oscilloscope for opens

my car died yesterday while driving about 35 mph down the road....after several attempts we got it to start long enough to get it off the road. Now we cant get it to run. It will start up but dies shortly after.

Have you replaced the map sensor?

It may be the camshaft sensor in the distributor. Sometimes the optical sesor can be cleaned. Most times, need new distributor or reman from ebay.
do not replace the knock sensor, it is never bad. ANd, it is in the middle of the engine. $1000 repair for nothing.

See this ste too.

http://autos.groups.yahoo.com/group/villagerquest/