Code 61

[John Boothby]

I have replaced my entire secondary vac system including all actuators, solenoids and check valves. I get the "Service Engine Soon" light even though the secondary parameters are not met, ie: rpm 3K and throttle to the floor. The temps are up though. I can be cruising at 65-70mph 2k rpm and if I hit a small grade and slightly increase the throttle, (below 3k) I will get the light. About a month after I replaced all the secondary components I got this light and traced it back using the FSM to the secondary solenoid under the front of the plenum. I replaced it and all was well until now. I am getting tired of r&r ing the plenum. Could it be a MAP sensor? I have a DRM chip, type unknown. I have checked the plumbing with a hand vac and all checks ok. I am getting frustrated!!