Most 2.5's have a problem with the HLA's (hydraulic lash adjusters) I have a 93 Probe GT with a 2.5 and that was the problem with mine. Here's a site that might help you out
http://homepage.ntlworld.com/dorothy...bemx/index.htm It's for MX-6's and Probes but the engines are pretty much the same. Hope that helps.