If you suspect overheat has caused a problem, you first need to run a compression test. That way you can eliminate some of the problems that are often caused when an engine is overheated. As you're pulling the plugs for the compression test, make sure the plug colors are even, and light to medium grey. Any dark or damaged plugs can indicate other problems. If the compression test indicates that all cylinders have good, even compression and you just have a dark plug, you may have dodged the big expense. Good luck.
There are many ways you could cure a rough idle. You must first diagnose why the problem started in the first place.
The choke mechanism on your 98 Explorer could be sticking. The EGR valve could also not be functioning right. Either of these issues could cause the rough idle problem.
The 1998 Blazer could have several problems causing rough idle. Check the air filter, fuel pressure, and EGR valve for a clog to look for the problem.
e.g.r. valve replacement fixed mine. symptoms where rough idle and "surged".
I have a 2004 gt that has also developed a rough idle also and can't find the problem.... I wish you had the answer....
If an alternator is going bad it can cause a rough idle in a 1993 Subaru Legacy. Cold temperatures in the winter can also cause a rough idle in the Subaru Legacy.
my 1990 300zx is idling rough what could cause this?
sounds like a vacuum leak
I am having the same problem, and poor acceleration!!
why does my vr commodore idle rough when at complete stop
rough idle smell gas
Why does my 2001 kia sportage idle rough?