1994 FZJ80 rough start when warm, eventually clears up

[tVille80]

I've tried searching but struggling to find threads with a similar issue.
1994 FZJ80 296,000mi
Not sure if it is relevant, but some background. I've had the truck for 8 years and the exhaust has always been in rough shape, O2 sensors barely in the bungs. Check engine light does not light up in the dash before I start the truck. No check engine light while running.

For the past 6 months I have noticed the truck has a lot of issues when re-starting warm or hot. When cold it starts no issue. When warm or hot it has a very rough idle, surges, sometimes will cut out. However, after 3 to 5 min of letting it do its thing it clears up and drives like normal. This is not my daily so I have just been driving it less because of the issue.

I do miss driving the truck and replaced the full exhaust systems. Warm or hot start issue is still present.

 

[gorbilax]

If your check engine isn’t lighting up when you first turn the key, your bulb is burnt out. Pull the cluster and replace the bulb, then see if you have a code. If you’ve got a code, that will give you a good idea of where to start. You may also consider checking fuel pressure and checking your egr.