Ok here's the deal. I just pulled my supra out of storage after sitting for 6 years or so. I have been systematically attacking the various systems. The fuel was obviously old so that was the first thing I changed along with the fuel filter. After that I found out that the fuel pump was bad so I changed that our with a Walbro unit. It cranked up after a few cranks but it would not idle and had a slight miss. I then pulled the plugs and checked them and the wires. Everything was in good working order, actually brand new condition. I checked the Idle Speed Control Valve and found that it didn't work when I applied power to the unit as specified in the TSRM. I ordered one from a member on here and installed it. I checked the TPS and found it to be within spec. I decided that it would be a good idea to have the injectors cleaned and tested. The injectors are freaking spot on. 447cc +-1 across the board. The miss only seems to be noticeable below 1500 rpm and it will not idle on its own. It runs like a champ all the way up to 5500 and boosts like it always did. Only upgrades are cat back and HKS intake. I've checked for codes multiple times and I have none. My next step will be to do a compression check and continue searching for a vacuum leak. If anyone has any suggestions please let me know.
Thanks, Jeremy
Cliff notes
Issue:
Runs rough below 1500 rpm and won't idle.
Items completed:
1. TPS checked
2. Injectors cleaned, checked, and matched.
3. ISCV replaced with working unit.
4. Fuel pump, filter, and fuel replaced.
5. Spark plugs and wires inspected (great condition).
6. No codes.
Thanks, Jeremy
Cliff notes
Issue:
Runs rough below 1500 rpm and won't idle.
Items completed:
1. TPS checked
2. Injectors cleaned, checked, and matched.
3. ISCV replaced with working unit.
4. Fuel pump, filter, and fuel replaced.
5. Spark plugs and wires inspected (great condition).
6. No codes.
