1969 Camaro 307 with Edelbrock 650 4bbl

So the car runs fantastic when I first fire it up. If I drive it around for about an hour it starts to diesel a little at idle and feels like it's missing half the cylinders when I hit the accelerator. I have to flutter the gas pedal or it feels like it'll get die out. Eventually it gets up to speed and runs smooth, but it sounds like hell getting there. Everything about this feels like a vacuum issue, but I've replaced all of the tubing recently and checked the seals. I'm going to keep going down that route and get a vacuum gauge but I wanted to throw it out to the community and see if anyone had any other suggestions.

 

One possibility is an intake manifold leak, that shows up after the engine warms up and things start to warp. And it could be on the inside (lifter valley side), where you wouldn't know it.
Have you recently replaced the intake manifold, and/or checked to see if the bolts need to be re-torqued?

 

I have not. One of the guys on another forum site suggested the following:
Does this sound like a reasonable test to you? If so, it's a little easier to shoot some starter fluid in the area that to torque down the bolts and risk crushing the gasket or stripping a bolt head.

 

are you sure you hooked up all your vacuum lines in the correct spot

 

lol, I believe I do but I've never claimed to be a pro at this. However, I would assume that if I had the hoses connected in the wrong spots I would have issues much earlier in my drive correct?

 

probably but it is always possible it would be where i would start just double check your work you just did since im assuming it started after you did your vaccum lines

 

Actually this was a problem before and partly the reason for replacing the hoses. The hoses that were there were old and cracked. One had a severe leak and caused the car to bog out really early in the drive. All of the hoses are new and cut to appropriate lengths to avoid pinching and crimping. All connections are secured with threaded hose clamps with the exception of the hose from the carb to the vacuum advance. I was partly joking earlier and am certain the hoses are connected in the right places.

 

alright just checking

 

Greatly appreciate it. I had an electrical issue last week that was due to a wire being hooked up in the wrong spot. I always appreciate people reminding me to check the basics first because I tend to overlook them and assume it's something more complicated.

 

i just say stuff like this cuz i always miss the easy stuff