Hi, my 86 GT 5.0 (daily driver) recently developed this thing where it cranks up right away, revs up a bit as usual, but then instead of settling in to an idle it just dies. This only happens when cold ( as in sitting over night). And it does it every morning now.
2nd crank always starts fine and then does NOT die. Idles fine, drives fine. No other issues other than the die after first crank when cold.
Also, when I crank it cold after sitting over night and I juice the gas pedal just a little it prevents it from dying and then when I let off the gas it goes into idle just fine.
So it doesn't seem like a big deal, just a little nuisance after it sits over night. I've gotten in the habit of just tap the gas pedal a little bit when i start it to keep it from dying and then all is good.
My question is whether this is an indication of something else going on or changing that I need to think (or worry) about? It just seems strange to me that it just started doing this "out of the blue" about a month ago and now it does it every single morning, without anything changing in the setup. Never had this issue in the past...and I have owned this car since it was new in 86!
I was thinking maybe it had something to do with weather shifting from cooler to warmer and perhaps the winter mix gas transitioning to "normal mix", but it didn't do that last year at this time (or all the years before).
Just wanted to get some input from you guys before I start dicking with the TPS and air mixture ( it has one of those idle air control adjustment plates by the way).
Thanks for any input.
By the way, it is basically a full stock set up. Only mods are a CAI and a larger throttle body. I added the IAC adjustment plate after the CAI and throttle bottle so I could dial in a steady idle. Other than those things...stock.
-Eric
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