Hello, I have an 95 S10 Blazer with a 4.3 Vortec, 4DR, 4X4, automatic.

When I start out in the morning (usually cooler weather) it runs like a top, I'll drive 35 miles to work, no probs.

When I come home at night (hotter weather) I'll make the same trip and the vehicle spits and sputters, rough idle at stop lights, flutters when I step into it, usually worse going uphill. Does not display any 'check engine light' or other misc code(s).

So the problem is that when it is warmer temperatures outside (weather), the rig runs like crap but when the temp is cooler it runs great!

I am the type of guy that will start replacing this, then that, then this, then that till I correct the prob. Thank God I found this forum.

Anyone care to share what they think the problem might be?

TIA

 

i would check the coolant temp sensors and the iat sensor first