03 ford escape idles at 1200rpm. cleaned iac replaced bank 2 sensor 1 o2 sensor vacuum lines plugs and intake gaskets cleaned tb iac . runs great 187,400. rpms drop to 850 when ac on. fluids good.

could still be a vacuum leak.

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The first you should be taking when getting error code should be to replace the faulty spark plugs and their respective wiring. Also check for faulty distributor and ignition coil. If everything till now is fine then and only then go for cleaning throttle body.

The regulator is on top of the engine along the gas line. It has a vacuum line on top. Start the truck and pull the vacuum line off the regulator. If fuel comes out of the regulator, it has failed. You can run pretty rich with a busted regulator-especially at idle.

If the O2 Sensors are original,you could just change the front 2

The ones closest to the engine.

Any other issue you need to actually diagnose, as codes
are for just that reason

They don't ever tell you to replace anything

Running rough is more the O2 Sensors

Plugs
MAF Dirty
Vacuum Leaks
Ignition Coils going bad

Bad injector ?? Bank 2

Air leaking around injector -driving O2 Lean

2197--trying to correct for over rich condition

Coil misfires

TPS Sensor

MAF ?

You need to take out fuel
at least at idle

Sounds like a broken or torn vacum hose, pcv valve clogged, or bad Idle air control motor. Did you spray carb cleaner on vacum hoses or near the plastic intake., and did the motor rev up or down? Those codes represent a lean condition which means most like a vacum leak or clogged idle air motor. Sometimes the intake manifolds crack or the intake manifold gaskets crack. FInd that vacum leak or inpect iac motor

Intake gaskets will **** air when cold and cooler weather causing a skip when first start up. this sounds like your problem

yes it could be. it may also be Vacuum leaks (Intake Manifold Gaskets, vacuum hoses, PCV hoses, etc.) also a dirty mass air flow sensor. but replace 02 sensors first, to see if problem is solved.

DTC P1506 is set when the PCM detects the engine idle speed is greater than the desired rpm. This is most commonly caused by a dirty or bad IAC valve. Cleaning the throttle body will, most likely, cure this problem.

p1131 means that the bank #1 O2 sensor, the bank closest to the firewall, cylinders 1-3 is showing a lean mixture. Could be a vacuum leak, a misfire on that bank, an exaust leak upstream of the O2 sensor, fuel control or injector problem on that bank, a faulty O2 sensor, faulty PCM, faulty wiring in the engine control wiring harness.

P0171In the vast majority of cases, simply cleaning the MAF sensor does the trick. I find it's best to take it off and spray it with electronics cleaner or brake cleaner. Make sure you are careful not to damage the MAF sensor, and make sure it's dry before reinstalling also Inspect all vacuum and PCV hoses, replace if necessaryCheck for a dirty fuel filter and proper fuel pressure

Have you a leak in the exhaust??even a small leak will cause the lambda value to be out check your exhaust