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Check your fuel pressure, your fuel pump could be weak or the fuel pressure regulator could be faulty....

You might also check the IAC valve, or TPS sensor. Do you get any service engine lights? It sounds like the engine may be running in open loop mode, where as the PCM detects a faulty O2 sensor in one of the three banks on this engine, until the exhaust gas reaches 600F the PCM disregards any fault codes sent via the O2 sensor.

It could also be leaking fuel injector seals, I had the exact same symptoms as described in the question. Had to replace the fuel injectors.

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8y ago
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