how do you know? the only way is to check...
thats the VERY first thing anyone should ever do to their car before thinking about engine mods, unles they plan on a rebuild anyways.
By 150,000 miles, the rings and valve seals (as well as head gaskets) may beon the downhill parts fo their life. doinga compression test will tell you if they are holding where they should or not.
if the compression is low (i believe on your engine 170ish is the low side...but dont hold me to that, mine has a lower compression than yours.) then you dont want to do much until you get that taken care of.
as a safe way to test compression, to make sure fo an accurate reading, take 5 readings, and average them out. the compression will be off a little from its previous reading.
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I dont even know how to test for my compression. Is it easy to do? or do i have to take it in and get it tested? and if i do have to take it in then how much money is that goin to cost me?