[BORDEN]

Originally Posted by Wilkins I dont know where to start. Ive never really dealt with FI engines before so im a little lost. any insight would be greatfully appreciated! 1) Its got a really nasty cam and sounds amazing at about 7-800 rpm, but at idle, the car will stay at about 800 rpm for a few seconds and then rev up to 1100 for a few seconds for no reason at all and then back down to 7-800. This one has got me baffled 2)Crusing down the highway, the temp stays at about 180-185. But if you have to stop at a light for too long or go through the drive through, it will easily get up to 210-215. But 2 mins of driving will cool it right back down. But the fan is spinning. If i hold it at 1500 while at a red light, i can maintain my temp. 3)Car isnt charging correctly. Battery gauge never goes over 11v-12v, even at 3000 rpm. It has a brand new high output alt and a optima red top battery. So i cant turn it off or else it might not start again. Cant leave it running or it gets a little warm. HELP!!!!

1) vacuum leak more than likely
2)5.0s run hot. the reason it is lower while your moving is the wind is cooling it down. put a 180 thermostat on and an electric fan.
3)I went threw three alternators before i found one that worked. i would check to see if you have U/D pullies if you do then just take em off and but some stock one on.

[ryans88gt]

Originally Posted by 95blackbeauty I had a rolling idle like that and it would go up and down then die. My problem ended up being insufficient Fuel injectors, went to 24# injecs and its been fine ever since.

That is very very unlikely. More likely that your stock MAF was giving a faulty signal and when you swapped injectors, you swapped out the MAF....or one of your stock injectors was intermittently getting stuck.

[Hunt_chevs]

5.0 Base Idle Reset

2. check/clean you battery terminals (improper connection can cause poor charging)