My truck Is running very weirdly, and break pedal is hard to push almost as if...

[Needsomeadvice]

...truck is not running at all.? 95 GMC jimmy- It has been running fine unitll I was on my way home from work, Thats when its started to happen. While im driving at 2000rpms or higher it runs fine but coming to a stop, it wants to stall but it doesnt, and while Im driving and when i go to press break pedal its hard to press and stop the truck as if the truck was shut off. and the service engine light just came on. this all just started at once today.

 

[passtoout]

you have low vacuum pressure or your break pedal start to size under the dash if this is all good the vacuum booster is gone

 

[jimanddottaylor]

Open the hood and look for a vaccuum hose about the diameter of your thumb. It should go from the engine to the power brake booster on the firewall above the brake pedal. I bet this hose is disconnected and sucking air.

 

[passtoout]

you have low vacuum pressure or your break pedal start to size under the dash if this is all good the vacuum booster is gone

 

[passtoout]

you have low vacuum pressure or your break pedal start to size under the dash if this is all good the vacuum booster is gone