I have a 1998 gmc SONOMA sls. I have put a ton of work into. I've had it a year, and has not ran good but only once. It has a new battery, waterpump, air intake sencor, idle control sencor, the sencor that maintains the air/ gas pressure in the manifold, even the fuel pressure regulator. The fuel gage, has never been right. It flips from full to empty. The truck starts with effort, half the time. You have to prime it with gas. To get it to kick over. Then it runs for a half minute to a minute then dies as though it run out of gas.what the heck is wrong with this Chevy???? 1998 gmc SONOMA sls, with a 4.3 vortec

Dennis Mulford

• 1055 Answers
• Posted on Jun 06, 2009

SOURCE: 1998 GMC Sierra- runs rough then stalls when

had this problem on my neighbors 98 chevy truck with the same engine !!
it turnd out too be the fuel pressure regulator,you have too pull the upper intake too replace it!!

SOURCE: 96 gmc vortec will not start

I AM LOOKING AT TIMING ISSUES OR INTAKE MANIFOLD LEAK.OR EGR VALVE STUCK OPEN.

Ronny Bennett Sr.

• 6988 Answers
• Posted on Jul 11, 2010

SOURCE: 02 gmc sonoma 4.3 engine starts and runs great for

Smell of the oil,to see if the fuel injector(spider)is leaking into the crank case,if so,the intake will have to be removed to repair the problem,oh,and change the oil.

SOURCE: I have a 1998 GMC Sonoma sls, with a 4.3 vortec engine. I've put a ton of new parts in. It's hard to start. Then when it does start. It will run for about one minute then dies. Why, and what's the pos

Fuel. Check fuel pressure. Replace the fuel filter. When you do this and if you still have problems. Then go after the fuel injection. It is under the plenum on top of the engine. This is a pricey part. I would replace the fuel pressure regulator first(still under the plenum) then replace the spider injection, as they call it. But when you get in there and you see the plastic injector lines broken, replace it all.