1997 Mercury Sable Questions

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I haven't changed fuel filter since I had car because I couldn't find it. I have now but havent been able to change due to cash flow. Thats also reason ive been running tank low on gas. I know, not good! My service engine light came on & I assumed it was due to that but went & had diagnostic test on it at AutoZone. They said camshaft position sensor. BUT im having absolutely no symptoms. My car is running great. So could fuel filter possibly cause this?
bought car 3 months ago
There was no indication that I was having any previous problem. It had been running and starting just fine. Engine will turn over, but not start.
I have a p0340 code from the emission test
while driving electric windows will not work.when I stop
and put car in park, they work fine. can you help?
I had air pump replaced hoses checked a local mechanic could not find the problem,the pump works its when the test is about through it stops causing the code please help cannot pass Oregon deq!
There is a loud knocking sound coming from top end twards ack of motor but when you push the gas a bring the rpm it don't knock as loud

Original owner, 133K miles, flushed system every 50K--Engine is Overheating after 10 to 15 mins. Upper hose line to radiator shakes w/ bubbling when hot and overflow cap whistles with new & proper mix of fluid. No hot air through cabin heat with full fan and highest temp.

What I have completed: changed thermostat; flushed lines w/treatment; blew out lines to heating coil and throughout upper system. Coolant flows out reservoir & radiator drain, line to thermostat, upper lines during inline radiator flush. Can't be sure of the flow through radiator or determine what is a proper flow of coolant during engine run.

Could radiator be clogged or waterpump bad?

Also P0420 code
The low power happens mostly when in first gear with either acceleration or slowing down.
I have changed fluid and filter and added lucas trany additive and cured this problem before! But is their a problem with these trans I don't know about?
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