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QuoteHow are the plugs and wires? Check the exhaust back pressure.Always start with the basics. Definitely get yourself and OBDI scan tool
How are the plugs and wires? Check the exhaust back pressure.
I use WINALDL on TBI trucks (as long as it is covered. The 1991 with 4L80E wasnt at one time.http://www.winaldl.joby.se/I made my own cable with some electrical probes and a Ethernet jack.You can see it here (you have to have a 9 pin output though. http://forum.73-87chevytrucks.com/smforum/index.php?topic=7711.msg47384#msg47384Used it to diagnose the Suburban I had.. http://forum.73-87chevytrucks.com/smforum/index.php?topic=3984.0What about the IAC?Pull the distributor and check the mag pickup the burb I worked on had them rusty and bad..
... Even though the Platinum plugs looked great I changed them and that was the problem all along
Even though the Platinum plugs looked great
QuoteEven though the Platinum plugs looked greatPlease don't say you used Bosch Platinum's
no but that was what was in it.
Quoteno but that was what was in it. They are absolute garbage
Have you checked the fuel filter?Sent from my iPhone using Tapatalk
Before drifting too far afield, verify the fuel pressure.