1996 F-150 / 4x4 / 5.0 / Automatic / 102,500 miles?

My 96 F-150's check engine light comes on for about 2 days...then is off for about the same time. The Ford dealer says the read out code is 99. They say there is no code 99, which means my processor is going bad, and to expect to pay over $300.00 to replace it. I'm not too thrilled about this, and I really... show more My 96 F-150's check engine light comes on for about 2 days...then is off for about the same time. The Ford dealer says the read out code is 99. They say there is no code 99, which means my processor is going bad, and to expect to pay over $300.00 to replace it. I'm not too thrilled about this, and I really don't trust the dealer anyway, all O2 sensors have been replaced, along with a full tune-up, but the engine still pings under a lite load, and i average around 12 MPG mostly city driving. Anyone have any ideas or suggestions?
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