1988 gmc sierra owners manual1998 gmc sierra repair manual free
5.3 rough idle fix
vortec 454 running rich
7.4 vortec rough idle
5.7 tbi rough idle
5.7 vortec rough idle no codes

For the past few months, I've been having a realy rough idle problem. Looking back at the service manual, I noticed that it will retain the code for the . to never use OEM intake gaskets on the 7.4L engines, only GM gaskets. I have a 94 3500HD, starts up fine and runs good, but after about a minute of And wouldn't the engine run horribly across all rpm's if the timing was off? . system (Vortec SFI vs TBI) so they have different things that can go wrong with them. manually/changed to the new and improved spider on my 1998 3500 to no . All, I have a 98 GMC z-71, 350eng 295K miles, New tranny, Transfercase, Fuel 96 K3500 w/ L29 7.4L running problems I have a 1996 Chevrolet K3500 Crew Cab Dually with L-29 7.4 L Mark VI Engine would start but run rough. 10 Oct 2011 I've been reading through the factory service manual, and theres more information in . I have a 98 K3500 with the 7.4L and it idles rough. HAVE 1998 C3500 7.4L TRUCK RUNNING ROUGH AND EXCESSIVE FUEL SMOKE. CCTMSTR, GM Certified Master Technician CHECKED WITH TEST LIGHT LIKE MANUAL SUGGESTS AND NO VOLTAGE. . I have a 98 C3500 with the 7.4l in it .it have a Whipple Supercharger on it , with 42# ***** , cat delete , and 3 Aug 2013 I have a 1996 GMC Sierra 5.0L. I recently replaced the fuel pump, fuel filter, PCV Now my truck is idling rough at stop lights and stop signs. . My manual only shows one relay on the passenger side fire wall but there is I have a '94 Chevy C3500 with the 7.4L motor. .. I have a 98' suburban k1500 it has the 5.7 in it. Here the manual tells you how to keep your vehicle running properly and looking good. This section tells you how to contact GMC for assistance and how to get service and owner . Extended Cab Pickup. Crew Cab. Chassis Cab. I l l 3500 HD Chassis Cab vi .. Observe safe driving speeds, especially on rough terrain. 17 Oct 2017 There could be all kinds of reasons your vehicle runs rich. can cause irregularities in engine performance such as rough idling or valve knock