# Loss of power uphill, 1973 Suburban 350 4x4 **URL:** \ **Category:** Maintenance/Repairs\ **Tags:** chevrolet, suburban, stalling\ **Created:** [August 14, 2010, 12:27am UTC](https://community.cartalk.com/t/loss-of-power-uphill-1973-suburban-350-4x4/53486 "2010-08-14T00:27:08Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![tadhilton](https://avatars.discourse-cdn.com/v4/letter/t/46a35a/32.png) [@tadhilton](https://community.cartalk.com/u/tadhilton)\ **Post date:** [August 14, 2010, 12:27am UTC](https://community.cartalk.com/t/loss-of-power-uphill-1973-suburban-350-4x4/53486/1 "2010-08-14T00:27:08Z")
My problem started a month ago: When I need power to climb steep grades the truck runs great for maybe 1/4 mile them suddenly looses power, so much that the motor returns to idle and I have to crawl up the hill. After I try to make it,(I always turn around) I notice my brakes feel like there is no power booster for about a mile while going downhill, then the brakes feel fine again. I can feel the pressure build back up. I never have a problem around town, it only appears after I begin to ascend up a hill. I changed the fuel filter, fuel pump, brake booster check valve and hose. After I changed the Fuel pump the truck did run better and I made it further up the hill, but eventually it stalled again. Any help would be much appreciated. ---
**Author:** ![cigroller](https://avatars.discourse-cdn.com/v4/letter/c/c68b51/32.png) [@cigroller](https://community.cartalk.com/u/cigroller)\ **Post date:** [August 14, 2010, 12:31am UTC](https://community.cartalk.com/t/loss-of-power-uphill-1973-suburban-350-4x4/53486/2 "2010-08-14T00:31:53Z")
Check the exhaust system for restrictions. This is quickly and easily done with a vacuum gauge. Here’s a great site for learning vacuum gauge basics - check out “Scenario 14” [http://www.secondchancegarage.com/public/186.cfm](http://www.secondchancegarage.com/public/186.cfm)