gas mileage droped 100 miles per tank full and lost power on 1995 Buick Riviera

I noticed some hesitation at first when maintaining a steady speed, then I noticed it was all most jerking at steady speed.now I changed the spark plugs,no help,then I changed air filter, no help I took it to a muffler shop and had a new cadeletic converter installed (no help)but what ever it is it's in the fuel to air mix or the super charger it self.
#1.Is the super charger hard to change?
#2. can I get one?
#3.how much are they?
#4.or am I way off on my diagnosis

Asked by for the 1995 Buick Riviera
3 answers 2 comments
you are way off. go back to basics. have the fuel pressure checked to see if you may have a leaking fuel pressure regulator that would drastically effect your mileage. could be that simple.

Roy
Hi>, The problem(s) you've mentioned "could" be attributed to the fuel/gas you're
using. Some of our gas stations in the NE U.S. have "problems" with trying
to keep water/condensation from accumulating in their underground tanks.
They don't filter out water from the gas before you pump it in your tank....so a
higher than average moisture content (water in gas) will cause the same
situation. Check with other drivers at that station. - callhow
I have had a service station for many years in the NE and there are several filters for this. granted, it will not be 100% effective but does get most of the contaminants. If this was the problem, then a lot more people would be effected and the service station would be bombed with complaints about this issue. I still think a back to basic approach is where you need to start.

Roy
Hi>, The problem(s) you've mentioned "could" be attributed to the fuel/gas you're
using. Some of our gas stations in the NE U.S. have "problems" with trying
to keep water/condensation from accumulating in their underground tanks.
They don't filter out water from the gas before you pump it in your tank....so a
higher than average moisture content (water in gas) will cause the same
situation. Check with other drivers at that station. - callhow
Whens the last time U changed the fuel filter?