Hard Start When Warm

[3800SERIESII]

My 1997 Pontiac Firebird 3800 fires up great in the morning, but once it is up to temp it has to be started twice (crank the key, no fire, crank again, start up but sometimes rough). Currently not getting a CEL but I did go to O'reilly's yesterday and had it scanned. Turned out there was a misfire on cylinder 4. So today I bought a coil pack to replace the 4/1 cylinder pack. It makes the engine run WAY smoother and there is not a miss while idling but it still starts the same.

I read that it may need a throttle body clean, or a MAP or MAF sensor.

Any suggestions?

Same thing happened with my dads 2001 silverado and it turned out to be a fuel modulator.

[Jfridge92]

things to check:

Check the fuel pressure regulator: Take a short drive, then maybe a minute or two later, with the car off pull the vacuum line off the FPR and smell it. If it smells strongly of gas, the regulator diaphram has failed and the regulator is bad.

Also, try cleaning your idle air control valve and throttle body, as well as the MAF.

[nos4blood70]

I second the cleaning. Helped my car a bunch with starts and idling.