Your motor mounts are probably blown. Go to your local parts store and they're not that much. Motor mounts control the forward and backward motion of the engine. If you car is a high mileage car, it is likely that the rubber in the mounts is blown out.
Key on, engine not running: 53-55 p.s.i....
Replace the sender unit
The most common reason for the harmonic balancer breaking on a 1994 Pontiac Bonneville SSEI is the inner and outer mass is breaking the balancer down. This happens because your engine is running rough or too high of RPM's.
Close to 200 degrees maybe a little more on a hot day or with the A/C running
A fully charged battery should read approx. 12.8 volts without engine running With engine running should read approx. 13.8-14.2 volts
it could be a range of things. it could be overheating, gas gauge is low, or your rpms are running too high.
Have your ignition module and switch checked. I had the same problem and that was the answer.
all engines hesitate when cold they need to get to proper running temp
a humming noise is usually related to the fuel pump about to go. or u just have a really loud fuel pump and everything is fine.
There is a Technical Service Bulletin on this particular problem. Easy enough to look up. There is no air filter in this system,I own one.
Day time running lights?
have a pontiac 6000 2.5 motor and it wont stay running