2006 navigator 5.4 150,000 miles. Vehicle had a slight miss or shutter for the passed 30,000 miles but has gotten much worse. Got misfire on start up p316 p302 p306 etc. p171 left bank lean. Normal cop inspection, checked plugs, not new but not done either. Problem with. This is you start replacing all components of spark only to find they are secondary effect of the real issue. Bogs after full throttle pass. With light throttle pressure. Smell of exhaust comes in cabin without presence of an exhaust leak. Much condensation coming from tailpipe, not coolant just water vapors. Burning crayon smell at times? Poor and erratic acceleration without cel

SOURCE: rough idle / varying oil pressure when accelerating

Ok not to keen on newer vehicles actually prefer the carburated ones, but oil pressure is supposed increase on your gauge when accelerating. If it wasn't going up before and just staying at 40 the needle might have been stuck. But idle should be 40 lbs and when you work the moter (reving or driving down the road) the guage should show an increase for every 1000 rpm above idle. Second if you can get a hand held scanner (bought mine off ebay for $30) check for any codes in your computer you will probably find that you either have a bank running wrong or some other sensor that needs to be changed. I'd go with getting my own scanner it saves alot of money and time, garages make their money here.

SOURCE: check engine light

nope not telling you.so you get my info for nonthing,and we have to pay for tech help...
sorry peope it's a gimmick

SOURCE: Low midrange power and very poor acceleration

Check fuel pressure/filters and airflow meter.

Testimonial: "fuel filter change helped alot, but still has some hesitation. thanks!"

SOURCE: coolant smell in the exhaust.

North star? Sounds like head gasket leak, but the key is the exhaust in coolant. There is a test for this...expensive to repair. More than just a gasket.

SOURCE: 2006 Elantra CEL STILL on after O2 bank 1 sensor 1 and flex pipe replaced

All that has to be done is use the codes you have had
for months ,to diagnose the systems with faults & make
whatever repairs are necessary. No big deal

Just have to actually do something,not you, a repair shop