Hi, everyone. I'm having a confusing issue with a 1988 4Runner with a 3.0 V6. It's a 4wd model with an automatic transmission.

It seems my RPM is limited to 2500-3000 in the 4th gear (with accelerator pedal fully pressed down), or any gear really since it shifts before going any higher. So, in essence I can barely get up to 60 mph driving on a flat road. When in park there are no issues with revving the engine.

It idles at 650-700 when in park. But idle drops to sometimes 500 if stationary and in gear.

There is no check engine light, no misfires, timing has been adjusted with a timing light. It doesn't run rough. The only issue is sometimes after sitting for a while it has a little trouble starting cold, but once warmed it runs fine.

I'm kind of wondering if it could be a mass airflow meter issue, or the truck could be in limp mode of sorts, but there are no lights on the dash and transmission seems to operate normally.

Thank you in advance for any advice!