I have a 90 gmc 1500 truck with 5.7 liter 350. It started running rough and trying to cut off at stop lights on my way to work. Checked the codes and had a 32 egr valve and a 44 lean o2 sensor. Looked at the plugges and they are white on the ends. I did some checking and everything seemed to point to low fuel pressure so I changed the fuel pump and filter but that didnt fix it. I found a vacume line broke and fixed it but still have the problem with it cutting off. I swapped out the egr valve and the temp sensor with ones on my 95 suburban with no luck. The distributer, rotor button and cap all look good. Right now the truck runs great in park and neutral but when you put it in drive it will idle until I hit the gas then its acts like it ran out of fuel. It doesnt choke down like the converter is locked or anything just acts like it runs out of fuel. It also doesnt act like its as bad in reverse as drive. In park and neutral it will rev up and idle like nothing ever happened. Thanks for any help you can give.
Saturday, April 13th, 2013 AT 6:49 PM