I cant recall if there are rubber cushions for the rear springs. if so one may be missing or bad.
It could be a bad control arm bushing.
Oh and make sure the springs are orientated properly.
Ive never tried it, however I was told you can use gas from a propane torch to look for vac leaks..supposedly if it sucks the gas in the idle will raise
First why would you want a stock one? Aluminum is way better for heat dissipation.
Second: The oem radiator isn't worth rebuilding. Its not cost effective when there are tons of aftermarket oem style replacements. I bought one at Advance Auto last time I needed one. Quality was good fit was...