A faulty Idle Air Control valve (IAC) can cause the engine to surge and the Check Engine light (MIL) to come on. Replacing the IAC valve will repair this issue.
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Sulfur deposits on the fuel sending unit can cause the fuel gauge to read inaccurately. Replacing the sending unit will repair this issue.
A buzzing noise at freeway speeds can be caused by the engine and transmission resonating through the transmission shift cable. The Power Control Module (PCM) must be replaced to stop the resonating noise.
On some models the alternator belt can amplify the alternator noise. Replacing the belt will quiet things down.