CODE PROBLEM............Please Help 300 and 340

I have a 96 hevrolet 1/2 ton Z-71 with about 150K miles on it. I have been in the Navy in San Diego for the last 3 years and the truck past their emission test. I just finished serving my duty and headed back to Texas and the CHECK ENGINE LIGHT came on. I had the codes read and they were

300 and 340. I have replaced all the O2 sensors, wires, dist cap, cam sensor, and still have it reading the same codes. The only performance problem is a very slight miss at idle. Driving back the performance and mileage were normal. Please help me diagnose this problem. Please respond to me by e-mail, since I am posting this on a friends computer, using my e-mail address.

snipped-for-privacy@yahoo.com

Thanks, Steve

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Steve
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