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Message: <blockquote data-quote="525iBoy" data-source="post: 72316" data-attributes="member: 1183">you guys forgot to check your1) dist cap & rotor2) spark plugs3) valves adjustment.Provided a basic tuneup is done (oil, filters, plugs etc.), sensors all ok & IF engine internals are in good condition the car will run rough due to typically one or more of the  below1) ignition problem (quite common)2) fuel problem (not normally andissue)3) air leaks (very common on older cars) -Itms 1 + 3 the most common,4) sensor problems - oxygen, AFM, idle valve (usually only idle V is the problem)for I), check the plus and wires and dist cap& rotorfor 2) buy a GOOD fuel injector cleaner, change your fuel filter, chk you fuel pump relayfor 3) get a POWER Flashlight and look for hardened hoses. esp  chk all hoses, hose clampes esp at joints and those near hot exhaust/engine partsfor 4) clean or buynew idle valve (300 or so)If not the above then generally you are in DEEP S__ __ __ and will probly need to spend major $$ (ie. above 1K) on an AFM, or engine rebuild, head overhaul as you may have low compression, worn valves, worn cams, bearing etc etc.</blockquote>