[00 SS]

My daily driver is an 88 Buick Park Ave. Lately, I've been having trouble with it running right when the engine is hot and I restart it. Almost seems to be vapor locking, but it's multiport fuel injection. Ocationally when this happens, I can bleed some "air" or maybe fuel vapor out of the schrader valve on the rail which sometimes helps, sometimes not. It starts, then idles like it's missing badly and the engine won't rev up. So far, I've been able to coax it into working and getting me where I need to go, but I at a bit of a loss as to why this is happening all of a sudden (the last week or so). The weather hasn't been too bad lately and it was certainly hotter earlier in the summer and it ran fine. It seems OK while I'm driving and after it's been allowed to cool down all the way.

The recent maintenance includes:
new fuel filter
new plugs
new coil packs and igniton contol module
Removed and cleaned injectors (really were pretty clean to begin with)

My ideas:
fuel pump is low on pressure allowing the fuel to vaporize in the rail while sitting after driving
Bad presure regulator not holding the pressure up while sitting after driving, or sticking not allowing the vapor to exit and return to the tank.

Any insight or ideads would be appreciated.

[z28jeff]

I had a very similar problem with my old 96 Jimmy. Low fuel pressure with battery power, then higher with engine running. Ended up being the fuel pump. It was giving us hard start issues for weeks (excessive cranking), then it quit on my wife all together in a mall parking lot....an hour away from home (IMG:http://www.frrax.com/rrforum/style_emoticons/default/rolleyes.gif) . I was able to get it running by hooking up jumper cables to a running vehicle. The extra couple volts were enough to get it going. I was able to drive it home, but once I shut it off in the driveway, it wouldn't restart. In my case it was the fuel pump.