I only put $10 in my tank at a time which gives me 2.9 to 3 gallons and sometimes I run that out til when the car starts sputtering, I don't do this on purpose though. I didn't clean the TB yet I was planning on doing that sometime this week. Yes there'* air in the tires. The car doesn't idle rough it just have hard starts most of the time whether it'* cold or hot. The car idles alright, about 700. I just changed my plugs about 3 weeks ago, they're ac delco.. Before I had ngk t55'* for about 3 months then I started to get a misfire. The car doesn't sputter. Yeah it kind of feels like the exhaust is restricted. I'm missing some HP in the sunny weather basically.
Since I had that last misfire on whatever cylinder and I changed the spark plugs and regained my HP back, I feel like its one of my injector, but I didn't note which spark plug came out what cylinder