Hi Robert,

my guess is that you do not get enough fuel to sustain more than 3000 rpms. The accumulator is there to help to keep the pressure up, but I wonder if your fuel pumps make enough pressure to sustain higher rpms.

When I replaced the fuel pumps on my 87, I routed the fuel hose wrongly with a kink in the hose and had exactly the result you describe.

Those are the surprises of buying 14 year old cars, my money is on the fuel pumps.

Good luck

Reinhard Kreutzer