So I posted in the newb section and now I have some questions I would like answered. Now this is where my questions start:
1. I have done NOTHING to this truck except put JB injector cleaner in it (about 150miles ago)

2. I have been driving it for the last few days and it studers at idle.

3. It seems to only be getting about 12mpg. I believe that this thing should get better than that with nice driving.

All of these things I want to fix. I have a FULL tune up planed for this weekend and I am hoping that will take care of the studder and a little bit of the mileage.

1.What are others getting is similar suburbans?

2. what else can I do for better mileage?

3. Are 13 city 17 highway realistic numbers, high or low? (1993 GMC C1500 SUBURBAN - MPG and Detailed Vehicle Information)

4. What do you think of the tire choice?

5. I was thinking of getting a set of 3/4 springs and an axle out of an 08 max with disks for the rear.

6. I am looking at the bridgestone airbags with the compressor for $500

7. Anything else I should of thought of that I didn't?
Sorry I know a lot of questions from a "Newb" but Easter Jeep Safari is in 4 weeks and I WILL be there. Feel free to comment on any of this. I will be looking around the site to try to get answers so as I find them I will modify my post.

 

So my suburban is a 1990 with a 454 and I get 12-14 with the fuel hungry pig under the hood.... I would think that you should be able to manage 13-14 city and 17-18 freeway with the 350 in there.

You may want to clean the TBI and see if that helps also swap the fuel filter out as a start after the tune up.