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Have been do some tuning with EFI and have developed a fuel pressure oscillation. Not at cruise like I read in another thread but at moderate acceleration and under load when towing. Duty cycle oscillates as well. But that may just be the ecm trying to regulate the oscillation or it may be the...

I'm trying to get a "stock" tune in a CM2100 ECM that previously had Smarty on it. It was supposed to be "returned to stock" but isn't playing well when I try flash new stock files to it using EFI. The truck will start then die after reflashing with the new files. I've downloaded some files from...

Has anyone seen the fuel rail pressure go into oscillation at part throttle? Happens at transmission shift point or when throttle is moved suddenly.