Ok i just replaced my spark plugs on a 1998 chevy silverado C1500 its been about three weeks and pulled some out and most are caked with a little bit of stuff and are black. I have to put a qourt of oil in every two weeks its not leaking anywhere and dont smoke unless i am getting up on it. Its not running right at 2000 rpm it shakes alittle any body can help would be great just bought the truck not even a year ago thanks

Brian Greer

• 37 Answers
• Posted on Dec 14, 2008

SOURCE: 2006 Chevy Cobalt engine is shaking real bad and car has no power

I WOULD TRY AND RUN A BOTTLE OF SEA FOAM THOUGH IT BEFORE REPLACING PARTS. YOU CAN GET SEA FOAM AT ANY AUTO PARTS STORE FOR ABOUT $9.00 A CAN.

Mike Butler

• 6674 Answers
• Posted on Jan 02, 2009

SOURCE: 2000 Chevy Silverado 4.3 will not start.

I'd disconnect my battery, and start unplugging every sensor connector, computer connector etc that I could find and spray them with contact cleaner, blow them off if you have compressor, add a little di-electric grease and put them all back together & try that first. You never know, you just might cure it, and materials are cheap.

SOURCE: Torque Spec for '99 Chevy C1500 5.7L engine lower intake manifold

On 5.7L engines, install the bolts and torque in sequence as follows:

1. Step 1: 71 inch lbs. (8 Nm).
2. Step 2: 106 inch lbs. (12 Nm).
3. Step 3: 11 ft. lbs. (15 Nm).

SOURCE: turns over but dont start let off key and sputters 3or4 times 1998 Vortec 350 Chevy Z71 4x4

The freeze plug you replaced was due to rust or was it pushed out by freezing temperature? These plugs are not designed to protect the engine block from cracking during freezing temperatures, they are there to remove the sand from the block after casting it. I would drain your system completely and flush out the radiator thouroughly and fill with plain water, then run the engine and see if oil gets in the water, if it does and the plug was out due to freeze, then your block is probably cracked, although you could just have a head gasket leak. Oil pressure (40psi) is higher then water pressure (17psi), so getting oil in the water is always more prominent than the other way around. Flush out the system and let me know if oil returns to the water, hope this helps

SOURCE: 1989 Chevy Silverado has been sitting for 3 years

I would check the condition of the fuel pressure regulator. If it's ok, I'd say you probably have a bad computer.