I have a 89 s10 blazer 4.3 vin Z. I was having problems with it having rough idle then when warm it would start up fine but start to die so gave it gas for bout 10 15 seconds and would be fine after that. Started looking found hose cracked fixed and checked all others. I checked IAC wasn't working right so replaced it. Also replaced the coolant temp sensor and Manifold absolute pressure sensor. It will not stay running at idle without giving gas but then it idles way to high. Have done the driving at 40 mph not for very long though only bout 5 mins and still not idling right. Need suggestions please help.