I have a 88 Astro Van 4 cylinder. I can find the throttle cable for the 6 all day but having problems finding the proper throttle cable for the 4 cylinder. Any suggestions on where to find or alternative?

 

Where did the old one break? If one of the ends came off, you can replace the end. If necessary you can even make a new one by getting a cable and putting the correct ends on it. Many years ago I repaired a cable on my motorcycle clutch cable by putting the same end back on after it fell off. I used silver solder and it lasted longer than I kept the bike.