stalling????

[igotjunk]

i have a 97 blazer that i baught in july this year. it only has 69,000 on it. when i baught it i figured i would do a tune up like usual- i replaced the oil and fuel filters pcv valve and i cleaned the throttle body. since then, it stalls without warning. it always starts and never kicks on the check engine light..
could the fact that when i changed the oil and i put lucas oil in it, cause this problem. i dont know much about this year blazer so i was wondering if maybe the oil is to thick now and is tripping a sensor? also i have a srange clicking under the passenger side floor when i turn, everything on the passenger side of this thing was replaced (at no cost) and it still makes the noise. anyone have an idea?

[Mikado14]

You need to check the ignition switch. Your year is known for defective switches.

[igotjunk]

thanks for you advice. i checked things out and it turns out that my fuel pressure regulator went to sh!t on me. i took today and replaced it. you would be amazed at the difference.... thanks again!!