I know there are some great car guys on this forum...hope you can give a fellow guitar player some advice. I have a 2005 Pontiac Montana Extended Base, V6 and I think it's a 3.4L engine. Anyway, I have an INTERMITTENT problem at startup. Most of the time it starts normally...but other times the engine turns over many times, like 15-20 times before it starts...but it DOES eventually start. I drive it daily and this happens maybe 4 times a week. When I say it turns over, I mean very violently...the whole van shakes a lot. Seems like there's LOTS of power even though the battery is at least 5 years old. I think it only ever completely failed to start twice, but I'm concerned it will get worse (the turning-over seems to be getting more frequent). Here is what I tried to do for troubleshooting, I tried turning the key to the ON position for a second, then turning off, then turning ON again to give the fuel pump a chance to power up before I started the engine. This seemed to help for a week or so, until one day it didn't help. Then I was back to the same old problem. Also I tried to see if it happened only on cold starts, or warm starts, but it happens with both...so that's not the issue. My experience with intermittent problems and my local service center, is that they just start replacing parts at random because there's usually no outward signs of failure...that could get expensive for an old van. Any advice on how to troubleshoot? I'm not a mechanic obviously... Thanks!