Egine will not exceed or barely decrease 500 rpms

[HXC573]

after fixing a 240sx SE that had been sitting underneath a tree with broken windows for four months and then removing that dreaded upper timing chain guide me and my buddy turned the car on for the first time and it ran fine with no weird noises other then the exhaust leak by the muffler. Here's the deal, it wont rev up at all . When we give it gas it actually slows the rev down a bit . unplugged the MAF to see if it was working , Works, unplugged the TPS to see if it would mess up, Works, His dad says it may be a vacuum leak . What do you think it could be ? throw your thoughts below.

[xErniexChaosx]

check the vacuum hose that goes to the master break cylinder. i had that issue once before and after a quick inspection i notice that hose had come off. After plugging it back in my car idle regular again and i was able to revv it up aswell. hope this help

[HXC573]

check the vacuum hose that goes to the master break cylinder. i had that issue once before and after a quick inspection i notice that hose had come off. After plugging it back in my car idle regular again and i was able to revv it up aswell. hope this help

Thanks for the reply , we will try this and then get back to you guys if its doest work.