1992 500 SEL - Starts fine..idles fine..revs fine in neutral initially...until warming up or driving about three miles...then starts missing and sometimes stalls. If stalled, often won't restart until it cools down ....30-60 minutes. Did not drive in winter but started periodically. Local "general" mechanic says injectors are problem. HELP...he wants to pull and clean for $600....Go for it??? Or are there other culprits...fuel pump, relays etc.???