Hi, JMorgan; Does not sound like a fuel pump issue. Sounds more like a vacuum leak. Possibly, EGR valve not closing? It's quite easy to check for vacuum leaks with a smoke test, but generally, only repair facilities have them.
i have a 2002 Mitsubishi Diamante with about 170K miles on it. My problem is when it is in park it idle around the 2 mark on the dash which seem to be high, but when you put it in drive or reverse it idles very unstable jumping from the 1 mark to almost 0 and feeling like it is about to die but never do. when driving it down the road it surges hard at stop lights like it is trying to pull off then feels like it is about to die. my biggest issue is that it DOES NOT HAVE A CHECK ENGINE LIGHT ON so i don't know where to actually look. can someone please help!
I have replaced:
Plan to replace:
Fuel pump once i burn done some gas out of the gas tank