[mcdon26]

What year is your blazer? And let me say, I feel for you and know it's been frustrating. I'd kinda like to work in conjunction with you, compare what we've done versus what we haven't. I actually think having both threads may limit the info we get together, or I'll just have to keep a watchful eye open for your's if and when you open a new thread.

I took the vehicle to my local GM dealer yesterday and basically got a shrug of the shoulder. Hooked up a engine scanner and no level out of spec were discovered. I had discussed with the service mechanic the possibility of the spider injector and nut kit replacement and the basic answer I got was it was worth a shot. I went in to talk to the parts people and they just confused me. 2 different parts guys told me my vehicle doesn't show it has the spider injector. WHAT!?!?! I'm now confused. they price me out 6 injectors and a body kit (?) for $991.00. Woe. Not what I expected. The body kit was $140 so I'm wondering if that may be the actually spider assembly. They didn't have one in the shop so I couldn't look at it. So, do I have the spider connector or not? Sure thought I did based on the research I had done. I don't want to open up the intake and find out I have the wrong part and no one has it in stock.

The nut kit was $40. Weather seems like it will be getting no higher than 70 for a while so this will not repeat itself until it gets hotter. I am going to purchase a fuel pressure gauge as suggested and leave it on and taped up so I can watch the pressure during all range of RPM. Pressure tests have been done by a previous mechanic with passable levels at idle. I leak down test was also done according to the previous mechanic and fuel pressure maintained.

I also want to put out there a few things I had not previously mentioned because I didn't want to be chasing a ghost and this was not the major symptom and as every mechanic I have talked to does not seem to think this is a symptom, but I always have. RPMs when I first start the truck cold are about 800. After the engine has warmed up and stopped at a light with the trans in gear, the RPMs are somewhere inbetween 550 and 600. This is not a rough idle by any means, low, but not rough. I do however get a slight loping of the RPM while stopped and in gear. The RPM will lope from 550 to 650 or any where within that range every 5 seconds or so. It isn't consistent and does it whenever. When driving at 60mph, my RPMs maintain a consistent 2000. I may feel a slight hiccup, and I mean ever so slight. If I wasn't paying so close attention to everything because this thing left me on the side of the road so many times, I would miss it. Also, at this RPM range - 1800 to 2000 throttle response os very poor, seems I can move the gas pedal half the distance without any response from the engine and then it drops down a gear flies up to 2500 RPM. And one last thing, after the truck is warm, and I have gotten somewhere, turned the motor off, put it in park the idle jumps to 750 RPMs then gently falls back down to 550 -600 RPMs. When I come back and restart it, same thing, 750 down to 550. But when I put it in gear, I have virtually no change in RPM idle is not rough, just low.

Just trying to throw everything out there.

MaxisP, don't forget about me if you end up finding a solution, please.