thats my problem I think the mechanic is full of fuel air or oil mixture

so Im taking it to another place today and see what they say

what I have is my oil pressure guage on the dash bounce..
that mechanic did a fuel pressure check and it was fine..then did his computer to the O2 sensor..flat line then the lamba computer flat line and then to the idle control valve and relay still flat line

then he comes out and tells me its the fuel frequency valve and the oil temp switch..its doesnt make sense to me..so I called another guy I get parts from and he said its the OVP so thats what Im having checked out today

Marie