i decided to do a valve lash adjustment this past weekend. to make a long story short, my car used to vibrate madly while accelerating, and after i did the valve lash its 90% better. a few were within spec, but i did all of them to tighter clearances to be safe. could the adjustment have made this much of a differance or could i have inadvertantly fixed the prob. some other way?:dunno: thanks.