Speedometer and temp guage malfunction

1997 DODGE CARAVAN
150,000 MILES
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BRADGAS27
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When the vehicle is on the road and gets to approx 65 MPH the engine will start to miss and the temp guage and the speedometer will fall like the car is off. The vehicle will also surge and miss only when the under power. This problem will not happen when in nutral or in park. The vehicle has also dropped to 9 MPG.
Dec 4, 2011 at 2:03 AM
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SATURNTECH9
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Have you checked for codes yet?Thats where i would start and post the exact code numbers not code descriptions.
Dec 4, 2011 at 2:06 AM
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BRADGAS27
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I have checked for codes and no codes have been registered.
Dec 4, 2011 at 2:12 AM
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SATURNTECH9
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Have you made sure the battery cables are clean and tight?Also had the battery and alternator tested?
Dec 4, 2011 at 2:16 AM
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BRADGAS27
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I have bought new battery cables and battery. I also had the alternator tested and everything checked out good. Could it be a body to frame ground problem?
Dec 4, 2011 at 2:22 AM
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SATURNTECH9
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A ground issue would be the next thing i would suspect.
Dec 4, 2011 at 2:39 AM
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BRADGAS27
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Would the grounding problem also be the reason for the high speed miss?
Dec 4, 2011 at 2:44 AM
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SATURNTECH9
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The missing sounds more like possibly bad spark plug wires especailly since you said it does it under load.Is the missing worse with the ac on?
Dec 4, 2011 at 3:15 AM
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BRADGAS27
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The miss is worse under load. I have not yet ran the vehicle with the ac on because it does not work. I just paid to have new plugs and wires put on and the problem is the same. Could I possibly have a cam sensor problem?
Dec 4, 2011 at 3:33 AM
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SATURNTECH9
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If you had a cam sensor issue it should set a code sounds like i would start with possibly a ground problem issue.
Dec 4, 2011 at 5:01 AM