code P0300 and low speed stall

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Dec 6, 2010 | 07:58 PM

garmar60

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Joined: Oct 2005

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code P0300 and low speed stall

we have a 2006 with the 5.4L. It will stall when comming to a stop or at low speed when turning. rpm drops below idle when you take your foot off the gas. also now we have P0300 random miss fire and miss, loss of power when at highway speed and trying to accelerate. can both of these be related to plug cats. the plugs have about 10k miles. the dealer replace the fuel pump, fuel filter and the cats about 30k miles (only had about 55-60 on the truck) I am wondering if we have a fuel injector problem causing the cats to go bad. we have replaced 2 coils in the last year but both had miss fire codes pointed to the cylinders that were bad.

I could use some help to figure out were to look

thanks
gary

Dec 7, 2010 | 02:05 PM

celjel

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Joined: Jul 2002

Posts: 299

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From: Ripley NY

My 04 was doing that too. Before I had a chance to get it checked out I had to change the starter.The ground wire was loose on the stud w/nut where it atacches to the starter. For some reason it hasn't had a problem since I changed the starter an tightened everything up like it should be. You may want to load test the battery and check all grounds as these can cause weird problems with the pcm.