i have a 1995hevy s10 blazer with the 4.3 v6. it has 2xx,xxx miles on it. my problem is that it has a rough idle. at first it was a constant almost dieing idle. we checked the sparked plugs and secured some more tightly and now it runs pretty smooth but when u press the throttle at all it goes into rough idle again for a few minutes then back to normal. what i need to know is what else could be causing it to do this?