Someone can. Just about anyone with a scan tool can probably tell you what
caused it. No one else can, just from what you've provided.
Some common causes from that vintage would include the 02 sensor. I'm not
sure if 93's looked at the gas tank pressure or not. You might want to make
sure the gas cap is on properly and completely.
Your best bet is to get the codes read.
Need a bit more info before any "ideas".
Trouble codes can be retrieved by using a paperclip to connect the two
top right pins in the ALDL connector under the dash. Just bend the clip
out into a straight piece of wire, then bend it into a U shape and put
the ends into the two connectors at A and B. Now turn the key ON (DON'T
try to start the engine, just ON) http://snipurl.com/npsp for a
picture of the connector and the two terminals to connect
Now count the flashes of the SEL.
It will read out the codes in sets of three. So Flash pause
Flash,Flash long pause Flash pause Flash,Flash long pause Flash
pause Flash,Flash Actually is a code 12 It will flash the code 12
three times to show it is in diagnostic mode, then current trouble codes
will flash in order from low to high.
Get those codes and you can look them up online at
Don't jump to the conclusion that the parts referenced are actually bad
some items will set codes when it is another part causing the problem.
For instance a code 32 says EGR circuit. Could be a bad EGR valve or
plugged passages in the intake or head. OR it could just be a piece of
carbon sticking the EGR open and causing a very rough idle and hard
starting. (VERY common problem with the 4.3)
Follow the diagnostic tree or post back here and someone will be glad to
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