99 Civic EX 5speed coupe.

Speedometer needle was bouncing while on the highway, then it stopped working. Started losing power, stereo shut off, I had the gas pedal to the floor and it wouldn't accelerate. All of this happened within 5 minutes. So I changed the alternator. Then I rechanged in 20 days because the same problem occurred AGAIN. I disconnected the negative terminal on the battery and car shut off RIGHT after I installed new alternator. Codes P1298, P0135, P0500, & P0141....I know there was a recall with the wiring harness near the intake manifold, but my car's VIN # didnt fall in that category and I didnt see anything burned or messed up when I changed intake manifold for performance. I did notice o2 sensor wiring was burned (the one under the car near where the headers and cat meet. I disconnected it and I still have the same problem. Also AC is not working properly. AC only gets cold when I am accelerating on highway. But when I am at a complete stop, only hot air comes out. And when I am at a complete stop, with AC on, it idles near 500 rpm. Please Help! ThankYou!

 

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