95 gmc bad miss....help

[modman7x]

First off, I know this is the "Chevy" forum, but when I post it in the "GMC" section, I dont get any help.

Here's the deal, 1995 gmc ex-cab 4x4 5.7 t.b.i., 267,xxx miles (new GM engine 25,xxx miles ago). The truck will run in park, at an idle, just fine. When the engine starts to warm up, it begins to mis-fire. When I go to put it in gear, it wants to die. If I quick drive it when its cold, it will start to miss while driving, as it gets warmer.

I have replaced the following parts..... Throttle Body, Distributor, fuel filter, cap, rotor, plugs, and coil.

Again, in park, when cold, runs great. Once it warms up, doesnt want to stay running, and spits and sputters.

ANY HELP WOULD BE GREAT!!!!!!

[maxwedge]

Check the fuel pressure for starters, look for 10-13 psi. A full scan should be done also to check sensor inputs, pay attention to the coolant temp. BTW, I am in the GMC forum frequently.

[modman7x]

Thank you for the reply, I did replace the coolant temp sensor (it was reading 130 degrees @195) and the fuel presure is at 12.5 psi. After replacing the temp sensor, it made a big difference, but now it stalls when in gear, at a stop.
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[rhandwor]

Try spraying along the edges of the intake manifold when the engine is hot. If you find an air leak the engine will smooth out.
Also check the egr system.

[hal 67 chevelle]

ihave 91 does the same thing iwill try thank you