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yea thinking looks like air leak somewhere too, idle spark goes down to 4 deg and tps to zero shows it's trying to lower idle rpm but there is too much airlooks you have a large vacuum leak somewhere
long term fuel trims almost maxed out and MAF reading low
did you check LTFT at 2500rpm
edit= just noticed one screen shows maf low and one shows maf correct
need the 2500 rpm to determine if vac leak or fuel delivery problem
Should i replace the MAF or IAC again by a different part number iac .. could the problem be there ?yea thinking looks like air leak somewhere too, idle spark goes down to 4 deg and tps to zero shows it's trying to lower idle rpm but there is too much air
I will re-check for vacuum leaks , but for the fuel delivery all oem parts from acdelco or high end aem parts injectors are factory oem though recently checked and ultra sonic cleaned so .. i think i will start with tracing vacuum leaks firstwhere did these fuel system parts come from
i am concerned about the high fuel trims at 2500rpm
looks like you have a vacuum leak
and weak fuel delivery or incorrect injectors