Van stalls, gmc savana 5.7 ltr 3500

What is your question?

Ive been having an issue lately where the oil pressure guage will drop when i take my foot off the accelerator, and sometimes drops to zero and the van stalls... ive replaced the oil pump but it still does it... problem is i drove to arizona (4hr straight drive) and back again a few days later... and it ran perfect... then i do a local run here about 1.5 hrs and on the way back out of no where the oil pressure gauge drops the check lights icon jumps on and the it stalls... i can drive it fine so long as the accelorator is pressed... then after a while... 15 mins... to an hour... it runs fine again... im lost lol need help

What makes this problem better or worse?

Maybe more when hotter... but sometimes it fine

How long has your 2001 GMC Savana 3500 had this problem?

3 months