[47silver]

I did not think of that, it is 30 here so in the cold mode.

So the problem with his hard start may not be a cold start valve it may be an air leak causing him to run lean.

I tested the vacuum on mine with a shop vac, i dont know how accurate it is but seemed ok to me.
Here is how i did it: i have a vom that measures current. I sealed the intake end of the shop vac and turned it on and measured the current.
I then sealed the throttle body intake with a tennis ball and rubber glove and the exhaust the same way.

I put the shop vac into the popoff valve hole and sealed it in. I turned on the shop vac and let it run and measured the current to the motor....It was very close.
I noted that the rubber glove in the exhaust and tennis ball was being sucked in and so was the rubber glove on the throttle body. If i would have had some of those 4th of july smoke bombs i would have set them off in the engine compartment to see if any smoke came out of the shop vac exhaust, next time i will.

I think it may be a method of checking vacuum with some refinements. Maybe an actual vacuum gauge would be best.

An alternative would be to reverse the flow of the shop vac and pressurize the system,, seal the exhaust etc and then use those smoke bombs to pump smoke into the shop vac intake and then into the system.