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they make a by pass plug for the rear o2 sen .get it plug it in clear the code and you shouldnt have anymore prob you might also have broke the porsolen on the front o2 sen takeing them out it is easy to do . look in one of the 5.0 mustang books just about every on seals the plun by pass.

sound great to me but the motor has a lot of miles you need to think it will not be long befor you will need to overhaul some things and the 4.6 motor does not have any cheap parts on it . just saying

If someone have had this problem and can help me please. I can drive the car a 100 miles get out go in a store come out and the eng will have a slight miss and the light will come on i have changed all the soft vaccume hose even the one front the throttle body it goes to the vaccume spear...

Fuel pump should come on for around 5 sec if not you should have a fuel relay but like en urns said a voltmeter is the best don't let it intimidate . Hey wmburns I have the 99 cobra convert lean bank 2 found the vacuum hose the one on the throttle body . No more lean bank 2

No they fit and they are the better head for your car

It is better to take the motor out the bottom its so much easier comes right out with the kember

Man I feel for you I have and 99 cobra convert I had to have the motor rebuilt a compony here in Austin Tx called PMP did mine this guy does some bad ass engines

I did have a exhaust leak took care of it and code went away for about a week came back today I have check all vacuum lines there all good PVC also good

iam getting a check eng code lean bank one and two car runs good no miss and it has planty of power has any one had this problem? if so what did you do to fix it. i have looked for vacumn