The Buick has 130,000 miles and in Jan. 2014 I replaced the No. 4 cracked plug. This week, Aug. 2015 I had to replace it again. Cracked again. Why?????

just seems to do it if its warmer than when colder. gauge says putting out 14.4 to 14.7 chargeing amps.

Second time I asked this!!!!

Only blows out of the defroster vents

I want to test the fuel pressure, I have the gauge I'm just trying to figure out what the range of spec numbers would be.

As the fuel becomes less the gauge reads higher than actually is.

1st happened when in CA. no code set. had plugs, wires and fuel filter changed. no change. drove home to OR and had a misfire when accelerating up hills, entrance to freeway, etc. had shop check here in OR, couldn't find anything wrong. said to drive till code set. what gives?

no help. no codes set. drove from ca to or and no problems when running at speed. occasional miss when giving it more gas to climb a hill.