It's pretty cold up here these days so my laziness at properly troubleshooting the vacuum lines hasn't entirely been laziness, it's damn cold out in the garage! And I can't idle the car in the garage anyway. So I've made a proper effort now that I know where to hook up the mityvac, thanks Lorainfurniture.
The EGR does not hold vacuum, so I plugged it off.
I found that one of the lines going to the HVAC was not holding vacuum either. I thought, surely plugging two vacuum leaks would fix it. Sadly no, problems persist. I took some video.
The first part is just idling and shifting the transmission around to demonstrate the dropped idle and the stutter, which is hardly noticeable in the video but very pronounced in person. The oil pressure gauge is probably the thing to watch here. Second part is me flooring it from a slow crawl, major stutter doesn't want to go, threatens stalling. In fact, it stalled on me backing out of the driveway. I can floor it on the highway and it downshifts like it should and does not stutter or bog, acceleration seems normal. Third video is the vacuum state as I mess with the throttle. You can hear the engine bog and stutter much better here. I rev it slower to show that it performs normally when throttle is applied slowly. It's blurry, sorry, but it's at about 16/17 HG which I perceive to be within reasonable operating range for these motors based on what I've read around here. The engine was as warmed up as it's been getting lately (have another thread about engine temp, it's running cool).
http://www.youtube.com/watch?v=IANlAFwoEt8
So, what do I try next?
Again, all ignition components have been replaced with the exception of the coil. I don't know how to test a coil and they aren't exactly cheap so not sure how to eliminate that variable. Otherwise, the car has 195k on it and my guess is original injectors, but no idea really. Would a bad fuel pump cause this?
Pics are of the blocked off vacuum lines. The EGR is disconnected. Anyone have any idea what the red vacuum line that I disconnected is?
