Problems with Blazer S10

[thunder670]

Hi everyone!

My 88 Blazer S10 started to act funny the other day.
It would be hard to start all of a sudden, and when it started it runs very rough on idle, almost dies. Sometimes it runs fine.. Weird!!
Then the other day i came home and i smelled something funny and it ws smoke coming out under the hood, it freaked me out. I looked around and then Oil sending switch seemed to leak oil and it ran onto the exhaust and made it smoke. Well I changed it, but it still does the same idle problem. It runs rough. I stop it and start it again and it runs fine.....Whateve it feels like. I really dont understand what it is. The starter works fine and the engine turns and everything, it just takes forever to actully start sometimes. Hope some of you guys have any idea what this could be.

Thanks in advance.

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Do a good tune up, including fuel filter