I just bought a clean 1995 Chevrolet Suburban 4x4 2500 with the 454 engine and automatic transmission. This vehicle had a dead battery in it which I replaced before I bought it (no check engine light yet since I only drove it home 30 miles). This vehicle runs really good, but it dies at idle. However once it warms up after about 15 minutes it will stay running at idle.

I was told it needed an oxygen sensor and I have already replaced the oxygen sensor with a $20.00 Bosch unit from Auto Zone. This did not change how the truck ran at all. It still dies at idle.

What should I check next? Thanks in advance for any help.

 

Since this 95 Suburban will run fine at idle once it warms up I was thinking it might be a vacuum line leak? Of course it could be something else. Just wondering what other people have done to fix similar problems.