hi all,

I have an '88 tintop (298K miles) van with this problem. It starts fine,
idles fine, revs up fine. But recently when it reaches operating
temperature it stumbles, almost dying not willing to go up higher rpm. This
happens with warm or cold outdoor temperatures.
Things have been done a few days ago.
- New dist. cap and rotor
- NGK BP6ET are recent.
- Throttle body switch checked fine
- Idle screw on throttle body cleaned
- A good fuel pressure regulator was swapped in.
- Air filter checked.
- AFM connection checked
- No vacuum leak on any hose.
- Idle control valve checked, working fine

So what happened and what to do next...?

Thank you for any help...

dan