checked the fuel pressure yesterday. It was pretty steady around 82psi and held it idling and revving just fine. The lower port was around 79psi. From memory i believe those numbers are normal? I drove it on a 2 hour round trip today and it did fine other than occasional power loss under 2-3k rpm and a misfire when you first start it. Often i find a delay in acceleration when driving spirited though.

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99' ML320
03' C32 AMG
89' 190e