low power

  1. T

    New engine, No Horse Power!

    Need help. 1998 k3500, L31, 4L80e 300k miles, old engine was running fine but burning lots of oil, leakdown tests were pretty crappy, leaking past valves. Replaced engine with stock L31 from ATK through local parts store. I'm an ASE master mechanic with 20+ years experience and have changed...
  2. A

    89 GMC C1500 low power

    I have an 89 GMC C1500 that was given to me recently. It has the 350 in it, and sometimes the CEL comes on and I can't push it past 45 MPH, and it wants to die under acceleration when it's in that state. New injectors, fuel filter, fuel pump, PCV valve, plugs, plug wires, EGR valve, and...
  3. Mullet man

    94 k1500 350 tbi with 4l60 transmission,Very low power while in gear and back fires

    So this is a continuation of a previous post but a new issue, anyway, I replaced the distributor got the truck running, took it for a short test ride around the block and got back, the truck was so low on power it could barely lug itself up my hill it took two tries, ignition coil is new and the...
  4. P

    1998 K2500 5.7L - Hard Start/Low Power

    Vehicle 1998 GMC K2500 Suburban 4x4, 5.7L V8 Work Done New fuel pump, Tru-Grade brand, P/N D5331028 (With California emission. With Module Code GFN. Without Low Lubricity Fuel System Sender. Wiring Harness Included. Internal Strainer Included) New fuel filter Locking gas cap Concern I bought...
  5. T

    1996 k2500 low on power

    1996 k2500 5.7 fuel pressure is 60psi with key on engine off when it is idleing it drops down to 50psi and after i turn it off it will drop to 0psi. reason i checked fuel pressure is truck is low on power all across the rev range. is there anyway to tell if it is fuel injectors vs fuel regulator...
  6. J

    2000 gmt400 3500hd 7.4 vortex low power

    Hi folks I'm new here and this is my first post. This should be the right place for questions for this truck. Truck has 90k miles with a 12' flat bed. Fuel pump had been replaced before it was parked a couple years back. When got it up and running had low power, wouldn't hardly pull itself...
  7. McSweeney

    97 vortec 305 intermittent low power, poor mpg rough idle in park.

    I have a 97 c1500 5.0 vortec it has weak acceleration, poor idle, and horrible mpg. Ive replaced a lot on this engine including all ignition except for the distrutor, and upgraded the injectors to mfi. Still feels the same. Once in a while it will feel better like it has good power again, but...

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