MAP sensor reading low vacuum

[grandprix34]

thats wat another specialized GM mechanic said after he ran some kind of TECH computer through the car...the MAP sensor reads lower than normal vacuum, which is an indication of bad timing....

is this true? or should i just go buy the MAP sensor and call it a day? j/k...

nah for reals, would bad timing cauz unstable MAP readings?

[Homer]

The mechanic look at his trusty TECH 2 and saw that MAP was low, and easy way to see if its the sensor or not is just to hook up a vac gauge to your intake manifold. Bad timming can casue weak vacuum becasue the intake/exhaust valves would be opening/closing at the wrong times.

[Ross96GTP]

maybe I missed an earlier post on your car and such or a difference in years. But check all your vacuum hoses. My car is a 96 and I've had to replace 3 or 4 vacuum hoses due to cracks, normally anywhere around a sharp bend in the line. Also, atleast in my car there is a main vacuum line that plugs into the bottom of the intake plenum on the driver's side. I didn't get it on all the way one time when changing spark plugs and it fell off. You would have thought I lost 2 or 3 cylinders by the way the car ran, blowing smoke, stumbling idle at best, and would barely move a few feet. Just an idea of another thing to check.

Ross